diff -ru4NwbB libpng-1.5.2/Makefile.am libpng-1.5.3beta06/Makefile.am --- libpng-1.5.2/Makefile.am 2011-03-31 11:23:47.610923954 -0500 +++ libpng-1.5.3beta06/Makefile.am 2011-05-07 21:41:13.791502061 -0500 @@ -161,9 +161,9 @@ rm -f $@ dfn?.out test -z "$(CPPFLAGS)" echo "com @PNGLIB_VERSION@ STANDARD API DEFINITION" |\ $(AWK) -f ${srcdir}/scripts/options.awk out=dfn1.out\ - logunsupported=2 - ${srcdir}/scripts/pnglibconf.dfa 1>&2 + logunsupported=3 - ${srcdir}/scripts/pnglibconf.dfa 1>&2 $(AWK) -f ${srcdir}/scripts/options.awk out=dfn2.out dfn1.out 1>&2 rm dfn1.out mv dfn2.out $@ diff -ru4NwbB libpng-1.5.2/example.c libpng-1.5.3beta06/example.c --- libpng-1.5.2/example.c 2011-03-31 11:23:40.691343668 -0500 +++ libpng-1.5.3beta06/example.c 2011-05-07 21:41:06.884857158 -0500 @@ -1,9 +1,9 @@ #if 0 /* in case someone actually tries to compile this */ /* example.c - an example of using libpng - * Last changed in libpng 1.5.2 [March 31, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * This file has been placed in the public domain by the authors. * Maintained 1998-2011 Glenn Randers-Pehrson * Maintained 1996, 1997 Andreas Dilger) * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) @@ -21,8 +21,12 @@ * working PNG reader/writer, see pngtest.c, included in this distribution; * see also the programs in the contrib directory. */ +#define _POSIX_SOURCE 1 /* libpng and zlib are POSIX-compliant. You may + * change this if your application uses non-POSIX + * extensions. */ + #include "png.h" /* The png_jmpbuf() macro, used in error handling, became available in * libpng version 1.0.6. If you want to be able to run your code with older diff -ru4NwbB libpng-1.5.2/png.c libpng-1.5.3beta06/png.c --- libpng-1.5.2/png.c 2011-03-31 11:23:40.702025995 -0500 +++ libpng-1.5.3beta06/png.c 2011-05-07 21:41:06.895412524 -0500 @@ -1,8 +1,8 @@ /* png.c - location for general purpose libpng functions * - * Last changed in libpng 1.5.1 [February 3, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -136,8 +136,63 @@ if (need_crc) png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length); } +/* Check a user supplied version number, called from both read and write + * functions that create a png_struct + */ +int +png_user_version_check(png_structp png_ptr, png_const_charp user_png_ver) +{ + if (user_png_ver) + { + int i = 0; + + do + { + if (user_png_ver[i] != png_libpng_ver[i]) + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + } while (png_libpng_ver[i++]); + } + + else + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + + if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) + { + /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so + * we must recompile any applications that use any older library version. + * For versions after libpng 1.0, we will be compatible, so we need + * only check the first digit. + */ + if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || + (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || + (user_png_ver[0] == '0' && user_png_ver[2] < '9')) + { +#ifdef PNG_WARNINGS_SUPPORTED + size_t pos = 0; + char m[128]; + + pos = png_safecat(m, sizeof m, pos, "Application built with libpng-"); + pos = png_safecat(m, sizeof m, pos, user_png_ver); + pos = png_safecat(m, sizeof m, pos, " but running with "); + pos = png_safecat(m, sizeof m, pos, png_libpng_ver); + + png_warning(png_ptr, m); +#endif + +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + png_ptr->flags = 0; +#endif + + return 0; + } + } + + /* Success return. */ + return 1; +} + /* Allocate the memory for an info_struct for the application. We don't * really need the png_ptr, but it could potentially be useful in the * future. This should be used in favour of malloc(png_sizeof(png_info)) * and png_info_init() so that applications that want to use a shared @@ -517,30 +572,39 @@ if (png_ptr == NULL) return (NULL); - if (png_ptr->time_buffer == NULL) { - png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29* - png_sizeof(char))); - } + size_t pos = 0; + char number_buf[5]; /* enough for a four digit year */ -# ifdef USE_FAR_KEYWORD - { - char near_time_buf[29]; - png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000", - ptime->day % 32, short_months[(ptime->month - 1) % 12], - ptime->year, ptime->hour % 24, ptime->minute % 60, - ptime->second % 61); - png_memcpy(png_ptr->time_buffer, near_time_buf, - 29*png_sizeof(char)); +# define APPEND_STRING(string)\ + pos = png_safecat(png_ptr->time_buffer, sizeof png_ptr->time_buffer,\ + pos, (string)) +# define APPEND_NUMBER(format, value)\ + APPEND_STRING(PNG_FORMAT_NUMBER(number_buf, format, (value))) +# define APPEND(ch)\ + if (pos < (sizeof png_ptr->time_buffer)-1)\ + png_ptr->time_buffer[pos++] = (ch) + + APPEND_NUMBER(PNG_NUMBER_FORMAT_u, (unsigned)ptime->day % 32); + APPEND(' '); + APPEND_STRING(short_months[(ptime->month - 1) % 12]); + APPEND(' '); + APPEND_NUMBER(PNG_NUMBER_FORMAT_u, ptime->year); + APPEND(' '); + APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->hour % 24); + APPEND(':'); + APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->minute % 60); + APPEND(':'); + APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->second % 61); + APPEND_STRING(" +0000"); /* This reliably terminates the buffer */ + +# undef APPEND +# undef APPEND_NUMBER +# undef APPEND_STRING } -# else - png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000", - ptime->day % 32, short_months[(ptime->month - 1) % 12], - ptime->year, ptime->hour % 24, ptime->minute % 60, - ptime->second % 61); -# endif + return png_ptr->time_buffer; } # endif /* PNG_TIME_RFC1123_SUPPORTED */ @@ -2257,19 +2321,20 @@ png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->gamma, png_ptr->screen_gamma) : PNG_FP_1); #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) - if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY)) + if (png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY)) { png_build_8bit_table(png_ptr, &png_ptr->gamma_to_1, png_reciprocal(png_ptr->gamma)); png_build_8bit_table(png_ptr, &png_ptr->gamma_from_1, png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) : png_ptr->gamma/* Probably doing rgb_to_gray */); } -#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */ +#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ } else { png_byte shift, sig_bit; @@ -2326,9 +2391,14 @@ png_ptr->gamma_shift = shift; #ifdef PNG_16BIT_SUPPORTED - if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND)) + /* NOTE: prior to 1.5.3 this test used to include PNG_BACKGROUND (now + * PNG_COMPOSE). This effectively smashed the background calculation for + * 16 bit output because the 8 bit table assumes the result will be reduced + * to 8 bits. + */ + if (png_ptr->transformations & PNG_16_TO_8) #endif png_build_16to8_table(png_ptr, &png_ptr->gamma_16_table, shift, png_ptr->screen_gamma > 0 ? png_product2(png_ptr->gamma, png_ptr->screen_gamma) : PNG_FP_1); @@ -2340,10 +2410,11 @@ png_ptr->screen_gamma) : PNG_FP_1); #endif #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) - if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY)) + if (png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY)) { png_build_16bit_table(png_ptr, &png_ptr->gamma_16_to_1, shift, png_reciprocal(png_ptr->gamma)); @@ -2354,9 +2425,9 @@ png_build_16bit_table(png_ptr, &png_ptr->gamma_16_from_1, shift, png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) : png_ptr->gamma/* Probably doing rgb_to_gray */); } -#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */ +#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ } } #endif /* READ_GAMMA */ #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ diff -ru4NwbB libpng-1.5.2/png.h libpng-1.5.3beta06/png.h --- libpng-1.5.2/png.h 2011-03-31 11:23:40.652780723 -0500 +++ libpng-1.5.3beta06/png.h 2011-05-07 21:41:06.846619596 -0500 @@ -149,8 +149,9 @@ * 1.5.1 15 10501 15.so.15.1[.0] * 1.5.2beta01-03 15 10502 15.so.15.2[.0] * 1.5.2rc01-03 15 10502 15.so.15.2[.0] * 1.5.2 15 10502 15.so.15.2[.0] + * 1.5.3beta01-06 15 10503 15.so.15.3[.0] * * Henceforth the source version will match the shared-library major * and minor numbers; the shared-library major version number will be * used for changes in backward compatibility, as it is intended. The @@ -301,18 +302,17 @@ * This is your unofficial assurance that libpng from version 0.71 and * upward through 1.5.3beta06 are Y2K compliant. It is my belief that * earlier versions were also Y2K compliant. * - * Libpng only has three year fields. One is a 2-byte unsigned integer - * that will hold years up to 65535. The other two hold the date in text + * Libpng only has two year fields. One is a 2-byte unsigned integer + * that will hold years up to 65535. The other holds the date in text * format, and will hold years up to 9999. * * The integer is * "png_uint_16 year" in png_time_struct. * - * The strings are - * "png_charp time_buffer" in png_struct and - * "near_time_buffer", which is a local character string in png.c. + * The string is + * "png_char time_buffer" in png_struct * * There are seven time-related functions: * png.c: png_convert_to_rfc_1123() in png.c * (formerly png_convert_to_rfc_1152() in error) @@ -670,8 +670,12 @@ typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp; typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; #endif +/* The complete definition of png_info has, as of libpng-1.5.0, + * been moved into a separate header file that is not accessible to + * applications. Read libpng-manual.txt or libpng.3 for more info. + */ typedef struct png_info_def png_info; typedef png_info FAR * png_infop; typedef PNG_CONST png_info FAR * png_const_infop; typedef png_info FAR * FAR * png_infopp; @@ -685,8 +689,10 @@ * PNG specification manner (x100000) */ #define PNG_FP_1 100000 #define PNG_FP_HALF 50000 +#define PNG_FP_MAX ((png_fixed_point)0x7fffffffL) +#define PNG_FP_MIN (-PNG_FP_MAX) /* These describe the color_type field in png_info. */ /* color type masks */ #define PNG_COLOR_MASK_PALETTE 1 @@ -791,20 +797,24 @@ typedef png_row_info FAR * png_row_infop; typedef png_row_info FAR * FAR * png_row_infopp; +/* The complete definition of png_struct has, as of libpng-1.5.0, + * been moved into a separate header file that is not accessible to + * applications. Read libpng-manual.txt or libpng.3 for more info. + */ +typedef struct png_struct_def png_struct; +typedef PNG_CONST png_struct FAR * png_const_structp; +typedef png_struct FAR * png_structp; + /* These are the function types for the I/O functions and for the functions * that allow the user to override the default I/O functions with his or her * own. The png_error_ptr type should match that of user-supplied warning * and error functions, while the png_rw_ptr type should match that of the * user read/write data functions. Note that the 'write' function must not * modify the buffer it is passed. The 'read' function, on the other hand, is * expected to return the read data in the buffer. */ -typedef struct png_struct_def png_struct; -typedef PNG_CONST png_struct FAR * png_const_structp; -typedef png_struct FAR * png_structp; - typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp)); typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t)); typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp)); typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, @@ -844,27 +854,20 @@ typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); #endif #ifdef PNG_SETJMP_SUPPORTED -/* This must match the function definition in , and the - * application must include this before png.h to obtain the definition - * of jmp_buf. The function is required to be PNG_NORETURN. (Note that - * PNG_PTR_NORETURN is used here because current versions of the Microsoft - * C compiler do not support the PNG_NORETURN attribute on a pointer.) - * - * If you get a type warning from the compiler when linking against this line - * then your compiler has 'longjmp' that does not match the requirements of the - * compiler that built libpng. You will have to write a wrapper function for - * your compiler's longjmp and call png_set_longjmp_fn directly (not via the - * png_jmpbuf macro.) +/* This must match the function definition in , and the application + * must include this before png.h to obtain the definition of jmp_buf. The + * function is required to be PNG_NORETURN, but this is not checked. If the + * function does return the application will crash via an abort() or similar + * system level call. * - * If you get a warning here while building the library you will need to make + * If you get a warning here while building the library you may need to make * changes to ensure that pnglibconf.h records the calling convention used by * your compiler. This may be very difficult - try using a different compiler * to build the library! */ -typedef PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), - PNG_PTR_NORETURN); +PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef); #endif /* Transform masks for the high-level interface */ #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ @@ -1105,10 +1108,208 @@ PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp png_ptr)); #endif +#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, png_colorp palette)); +#endif + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED +/* How the alpha channel is interpreted - this affects how the color channels of + * a PNG file are output when an alpha channel, or tRNS chunk is a palette file, + * is present. + * + * The default is to output data according to the PNG specification: the alpha + * channel is a linear measure of the contribution of the pixel to the + * corresponding output pixel. The gamma encoded color channels must be scaled + * according to the contribution and to do this it is necessary to undo the + * encoding, scale the color values, perform the composition and reencode the + * values. This is the 'PNG' format. + * + * The alternative is to 'associate' the alpha with the color information by + * storing color channel values that have been scaled by the alpha. The + * advantage is that the color channels can be resampled (the image can be + * scaled) in this form. The disadvantage is that normal practice is to store + * linear, not (gamma) encoded, values and this requires 16 bit channels for + * still images rather than the 8 bit channels that are just about sufficient if + * gamma encoding is used. In addition all non-transparent pixel values, + * including completely opaque ones, must be gamma encoded to produce the final + * image. This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' format (the + * latter being the two common names for associated alpha color channels.) + * + * Since it is not necessary to perform arithmetic on opaque color values so + * long as they are not to be resampled and are in the final color space it is + * possible to optimize the handling of alpha by storing the opaque pixels in + * the PNG format (adjusted for the output color space) while storing partially + * opaque pixels in the standard, linear, format. The accuracy required for + * standard alpha composition is relatively low, because the pixels are + * isolated, therefore typically the accuracy loss in storing 8 bit linear + * values is acceptable. (This is not true if the alpha channel is used to + * simulate transparency over large areas - use 16 bits or the PNG format in + * this case!) This is the 'OPTIMIZED' format. For this format a pixel is + * treated as opaque only if the alpha value is equal to the maximum value. + * + * The final choice is to gamma encode the alpha channel as well. This is + * broken because, in practice, no implementation that uses this choice + * correctly undoes the encoding before handling alpha composition. Use this + * choice only if other serious errors in the software or hardware you use + * mandate it; the typical serious error is for dark halos to appear around + * opaque areas of the composited PNG image because of arithmetic overflow. + * + * The API function png_set_alpha_mode specifies which of these choices to use + * with a enumerated 'mode' value and the gamma of the required output: + */ +#define PNG_ALPHA_PNG 0 /* according to the PNG standard */ +#define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */ +#define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */ +#define PNG_ALPHA_PREMULTIPLIED 1 /* as above */ +#define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */ +#define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */ + +PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structp png_ptr, int mode, + double output_gamma)); +PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structp png_ptr, + int mode, png_fixed_point output_gamma)); + +/* The output_gamma value is a screen gamma in libpng terminology: it expresses + * how to decode the output values, not how they are encoded. The values used + * correspond to the normal numbers used to describe the overall gamma of a + * computer display system; for example 2.2 for an sRGB conformant system. The + * values are scaled by 100000 in the _fixed version of the API (so 220000 for + * sRGB.) + * + * The inverse of the value is always used to provide a default for the PNG file + * encoding if it has no gAMA chunk and if png_set_gamma() has not been called + * to override the PNG gamma information. + * + * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode + * opaque pixels however pixels with lower alpha values are not encoded, + * regardless of the output gamma setting. + * + * When the standard Porter Duff handling is requested with mode 1 the output + * encoding is set to be linear and the output_gamma value is only relevant + * as a default for input data that has no gamma information. The linear output + * encoding will be overridden if png_set_gamma() is called - the results may be + * highly unexpected! + * + * The following numbers are derived from the sRGB standard and the research + * behind it. sRGB is defined to be approximated by a PNG gAMA chunk value of + * 0.45455 (1/2.2) for PNG. The value implicitly includes any viewing + * correction required to take account of any differences in the color + * environment of the original scene and the intended display environment; the + * value expresses how to *decode* the image for display, not how the original + * data was *encoded*. + * + * sRGB provides a peg for the PNG standard by defining a viewing environment. + * sRGB itself, and earlier TV standards, actually use a more complex transform + * (a linear portion then a gamma 2.4 power law) than PNG can express. (PNG is + * limited to simple power laws.) By saying that an image for direct display on + * an sRGB conformant system should be stored with a gAMA chunk value of 45455 + * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification + * makes it possible to derive values for other display systems and + * environments. + * + * The Mac value is deduced from the sRGB based on an assumption that the actual + * extra viewing correction used in early Mac display systems was implemented as + * a power 1.45 lookup table. + * + * Any system where a programmable lookup table is used or where the behavior of + * the final display device characteristics can be changed requires system + * specific code to obtain the current characteristic. However this can be + * difficult and most PNG gamma correction only requires an approximate value. + * + * By default, if png_set_alpha_mode() is not called, libpng assumes that all + * values are unencoded, linear, values and that the output device also has a + * linear characteristic. This is only very rarely correct - it is invariably + * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the + * default if you don't know what the right answer is! + * + * NOTE: the following values can be passed to either the fixed or floating + * point APIs, but the floating point API will also accept floating point + * values. + */ +#define PNG_DEFAULT_sRGB 0 /* sRGB gamma and color space */ +#define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */ +#define PNG_GAMMA_MAC 151724 /* Television with a 1.45 correction table */ +#define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */ + +/* The following are examples of calls to png_set_alpha_mode to achieve the + * required overall gamma correction and, where necessary, alpha + * premultiplication. + * + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); + * This is the default libpng handling of the alpha channel - it is not + * pre-multiplied into the color components. In addition the call states + * that the output is for a sRGB system and causes all PNG files without gAMA + * chunks to be assumed to be encoded using sRGB. + * + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); + * In this case the output is assumed to be something like an sRGB conformant + * display preceeded by a power-law lookup table of power 1.45. This is how + * early Mac systems behaved. + * + * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR); + * This is the classic Jim Blinn approach and will work in academic + * environments where everything is done by the book. It has the shortcoming + * of assuming that input PNG data with no gamma information is linear - this + * is unlikely to be correct unless the PNG files where generated locally. + * Most of the time the output precision will be so low as to show + * significant banding in dark areas of the image. + * + * png_set_expand_16(pp); + * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB); + * This is a somewhat more realistic Jim Blinn inspired approach. PNG files + * are assumed to have the sRGB encoding if not marked with a gamma value and + * the output is always 16 bits per component. This permits accurate scaling + * and processing of the data. If you know that your input PNG files were + * generated locally you might need to replace PNG_DEFAULT_sRGB with the + * correct value for your system. + * + * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB); + * If you just need to composite the PNG image onto an existing background + * and if you control the code that does this you can use the optimization + * setting. In this case you just copy completely opaque pixels to the + * output. For pixels that are not completely transparent (you just skip + * those) you do the composition math using png_composite or png_composite_16 + * below then encode the resultant 8 or 16 bit values to match the output + * encoding. + * + * Other cases + * If neither the PNG nor the standard linear encoding work for you because + * of the software or hardware you use then you have a big problem. The PNG + * case will probably result in halos around the image. The linear encoding + * will probably result in a washed out, too bright, image (it's actually too + * contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably + * substantially reduce the halos. Alternatively try: + * + * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB); + * This option will also reduce the halos, but there will be slight dark + * halos round the opaque parts of the image where the background is light. + * In the OPTIMIZED mode the halos will be light halos where the background + * is dark. Take your pick - the halos are unavoidable unless you can get + * your hardware/software fixed! (The OPTIMIZED approach is slightly + * faster.) + * + * When the default gamma of PNG files doesn't match the output gamma. + * If you have PNG files with no gamma information png_set_alpha_mode allows + * you to provide a default gamma, but it also sets the ouput gamma to the + * matching value. If you know your PNG files have a gamma that doesn't + * match the output you can take advantage of the fact that + * png_set_alpha_mode always sets the output gamma but only sets the PNG + * default if it is not already set: + * + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); + * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); + * The first call sets both the default and the output gamma values, the + * second call overrides the output gamma without changing the default. This + * is easier than achieving the same effect with png_set_gamma. You must use + * PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will + * fire if more than one call to png_set_alpha_mode and png_set_background is + * made in the same read operation, however multiple calls with PNG_ALPHA_PNG + * are ignored. + */ +#endif #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED PNG_EXPORT(36, void, png_set_strip_alpha, (png_structp png_ptr)); #endif @@ -1210,14 +1411,18 @@ * library. The following is the floating point variant. */ #define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001) -/* Handle gamma correction. Screen_gamma=(display_exponent) */ +/* Handle gamma correction. Screen_gamma=(display_exponent). + * NOTE: this API simply sets the screen and file gamma values. It will + * therefore override the value for gamma in a PNG file if it is called after + * the file header has been read - use with care! + */ PNG_FP_EXPORT(50, void, png_set_gamma, (png_structp png_ptr, double screen_gamma, - double default_file_gamma)); + double override_file_gamma)); PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structp png_ptr, - png_fixed_point screen_gamma, png_fixed_point default_file_gamma)); + png_fixed_point screen_gamma, png_fixed_point override_file_gamma)); #endif #ifdef PNG_WRITE_FLUSH_SUPPORTED /* Set how many lines between output flushes - 0 for no flushing */ @@ -1390,8 +1595,9 @@ #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ +#ifdef PNG_WRITE_SUPPORTED /* Set the library compression level. Currently, valid values range from * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 * (0 - no compression, 9 - "maximal" compression). Note that tests have * shown that zlib compression levels 3-6 usually perform as well as level 9 @@ -1406,13 +1612,38 @@ PNG_EXPORT(71, void, png_set_compression_strategy, (png_structp png_ptr, int strategy)); +/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a + * smaller value of window_bits if it can do so safely. + */ PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr, int window_bits)); PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr, int method)); +#endif + +#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION +/* Also set zlib parameters for compressing non-IDAT chunks */ +PNG_EXPORT(222, void, png_set_text_compression_level, + (png_structp png_ptr, int level)); + +PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structp png_ptr, + int mem_level)); + +PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structp png_ptr, + int strategy)); + +/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a + * smaller value of window_bits if it can do so safely. + */ +PNG_EXPORT(225, void, png_set_text_compression_window_bits, (png_structp + png_ptr, int window_bits)); + +PNG_EXPORT(226, void, png_set_text_compression_method, (png_structp png_ptr, + int method)); +#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION */ /* These next functions are called for input/output, memory, and error * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, * and call standard C I/O routines such as fread(), fwrite(), and @@ -1622,15 +1853,17 @@ /* Fatal error in PNG image of libpng - can't continue */ PNG_EXPORTA(104, void, png_err, (png_structp png_ptr), PNG_NORETURN); #endif +#ifdef PNG_WARNINGS_SUPPORTED /* Non-fatal error in libpng. Can continue, but may have a problem. */ PNG_EXPORT(105, void, png_warning, (png_structp png_ptr, png_const_charp warning_message)); /* Non-fatal error in libpng, chunk name is prepended to message. */ PNG_EXPORT(106, void, png_chunk_warning, (png_structp png_ptr, png_const_charp warning_message)); +#endif #ifdef PNG_BENIGN_ERRORS_SUPPORTED /* Benign error in libpng. Can continue, but may have a problem. * User can choose whether to handle as a fatal error or as a warning. */ @@ -2296,9 +2529,9 @@ * one to use is one more than this.) Maintainer, remember to add an entry to * scripts/symbols.def as well. */ #ifdef PNG_EXPORT_LAST_ORDINAL - PNG_EXPORT_LAST_ORDINAL(221); + PNG_EXPORT_LAST_ORDINAL(228); #endif #ifdef __cplusplus } diff -ru4NwbB libpng-1.5.2/pngconf.h libpng-1.5.3beta06/pngconf.h --- libpng-1.5.2/pngconf.h 2011-03-31 11:23:40.659587365 -0500 +++ libpng-1.5.3beta06/pngconf.h 2011-05-07 21:41:06.853624613 -0500 @@ -1,8 +1,8 @@ /* pngconf.h - machine configurable file for libpng * - * libpng version 1.5.3beta06 - March 31, 2011 + * libpng version 1.5.3beta06 - May 8, 2011 * * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) @@ -352,25 +352,8 @@ # endif # ifndef PNG_NORETURN # define PNG_NORETURN __attribute__((__noreturn__)) # endif -# ifndef PNG_PTR_NORETURN - /* It's not enough to have the compiler be the correct compiler at - * this point - it's necessary for the library (which defines - * the type of the library longjmp) to also be the GNU library. - * This is because many systems use the GNU compiler with a - * non-GNU libc implementation. Min/GW headers are also compatible - * with GCC as well as uclibc, so it seems best to exclude known - * problem libcs here rather than just including known libcs. - * - * NOTE: this relies on the only use of PNG_PTR_NORETURN being with - * the system longjmp. If the same type is used elsewhere then this - * will need to be changed. - */ -# if !defined(__CYGWIN__) -# define PNG_PTR_NORETURN __attribute__((__noreturn__)) -# endif -# endif # ifndef PNG_ALLOCATED # define PNG_ALLOCATED __attribute__((__malloc__)) # endif @@ -381,11 +364,8 @@ # ifndef PNGLIB_BUILD # ifndef PNG_DEPRECATED # define PNG_DEPRECATED __attribute__((__deprecated__)) # endif -# ifndef PNG_DEPSTRUCT -# define PNG_DEPSTRUCT __attribute__((__deprecated__)) -# endif # ifndef PNG_PRIVATE # if 0 /* Doesn't work so we use deprecated instead*/ # define PNG_PRIVATE \ __attribute__((warning("This function is not exported by libpng."))) @@ -403,11 +383,8 @@ # endif # ifndef PNG_NORETURN # define PNG_NORETURN __declspec(noreturn) # endif -# ifndef PNG_PTR_NORETURN -# define PNG_PTR_NORETURN /* not supported */ -# endif # ifndef PNG_ALLOCATED # define PNG_ALLOCATED __declspec(restrict) # endif @@ -418,11 +395,8 @@ # ifndef PNGLIB_BUILD # ifndef PNG_DEPRECATED # define PNG_DEPRECATED __declspec(deprecated) # endif -# ifndef PNG_DEPSTRUCT -# define PNG_DEPSTRUCT __declspec(deprecated) -# endif # ifndef PNG_PRIVATE # define PNG_PRIVATE __declspec(deprecated) # endif # endif /* PNGLIB_BUILD */ @@ -437,17 +411,11 @@ #endif #ifndef PNG_NORETURN # define PNG_NORETURN /* This function does not return */ #endif -#ifndef PNG_PTR_NORETURN -# define PNG_PTR_NORETURN /* This function does not return */ -#endif #ifndef PNG_ALLOCATED # define PNG_ALLOCATED /* The result of the function is new memory */ #endif -#ifndef PNG_DEPSTRUCT -# define PNG_DEPSTRUCT /* Access to this struct member is deprecated */ -#endif #ifndef PNG_PRIVATE # define PNG_PRIVATE /* This is a private libpng function */ #endif #ifndef PNG_FP_EXPORT /* A floating point API. */ diff -ru4NwbB libpng-1.5.2/pngerror.c libpng-1.5.3beta06/pngerror.c --- libpng-1.5.2/pngerror.c 2011-03-31 11:23:40.707921261 -0500 +++ libpng-1.5.3beta06/pngerror.c 2011-05-07 21:41:06.901904135 -0500 @@ -1,8 +1,8 @@ /* pngerror.c - stub functions for i/o and memory allocation * - * Last changed in libpng 1.5.1 [February 3, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -88,17 +88,122 @@ #else PNG_FUNCTION(void,PNGAPI png_err,(png_structp png_ptr),PNG_NORETURN) { + /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed erroneouly + * as '\0'. This was apparently an error, and png_default_error will crash + * in this case. + */ if (png_ptr != NULL && png_ptr->error_fn != NULL) - (*(png_ptr->error_fn))(png_ptr, '\0'); + (*(png_ptr->error_fn))(png_ptr, ""); /* If the custom handler doesn't exist, or if it returns, use the default handler, which will not return. */ - png_default_error(png_ptr, '\0'); + png_default_error(png_ptr, ""); } #endif /* PNG_ERROR_TEXT_SUPPORTED */ +/* Utility to safely appends strings to a buffer. This never errors out so + * error checking is not required in the caller. + */ +size_t +png_safecat(png_charp buffer, size_t bufsize, size_t pos, + png_const_charp string) +{ + if (buffer != NULL && pos < bufsize) + { + if (string != NULL) + while (*string != '\0' && pos < bufsize-1) + buffer[pos++] = *string++; + + buffer[pos] = '\0'; + } + + return pos; +} + +#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) +/* Utility to dump an unsigned value into a buffer, given a start pointer and + * and end pointer (which should point just *beyond* the end of the buffer!) + * Returns the pointer to the start of the formatted string. + */ +png_charp +png_format_number(png_const_charp start, png_charp end, int format, + png_alloc_size_t number) +{ + int count = 0; /* number of digits output */ + int mincount = 1; /* minimum number required */ + int output = 0; /* digit output (for the fixed point format) */ + + *--end = '\0'; + + /* This is written so that the loop always runs at least once, even with + * number zero. + */ + while (end > start && (number != 0 || count < mincount)) + { + + static const char digits[] = "0123456789ABCDEF"; + + switch (format) + { + case PNG_NUMBER_FORMAT_fixed: + /* Needs five digits (the fraction) */ + mincount = 5; + if (output || number % 10 != 0) + { + *--end = digits[number % 10]; + output = 1; + } + number /= 10; + break; + + case PNG_NUMBER_FORMAT_02u: + /* Expects at least 2 digits. */ + mincount = 2; + /* fall through */ + + case PNG_NUMBER_FORMAT_u: + *--end = digits[number % 10]; + number /= 10; + break; + + case PNG_NUMBER_FORMAT_02x: + /* This format expects at least two digits */ + mincount = 2; + /* fall through */ + + case PNG_NUMBER_FORMAT_x: + *--end = digits[number & 0xf]; + number >>= 4; + break; + + default: /* an error */ + number = 0; + break; + } + + /* Keep track of the number of digits added */ + ++count; + + /* Float a fixed number here: */ + if (format == PNG_NUMBER_FORMAT_fixed) if (count == 5) if (end > start) + { + /* End of the fraction, but maybe nothing was output? In that case + * drop the decimal point. If the number is a true zero handle that + * here. + */ + if (output) + *--end = '.'; + else if (number == 0) /* and !output */ + *--end = '0'; + } + } + + return end; +} +#endif + #ifdef PNG_WARNINGS_SUPPORTED /* This function is called whenever there is a non-fatal error. This function * should not be changed. If there is a need to handle warnings differently, * you should supply a replacement warning function and use @@ -127,8 +232,117 @@ (*(png_ptr->warning_fn))(png_ptr, warning_message + offset); else png_default_warning(png_ptr, warning_message + offset); } + +/* These functions support 'formatted' warning messages with up to + * PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter + * is introduced by @, where 'number' starts at 1. This follows the + * standard established by X/Open for internationalizable error messages. + */ +void +png_warning_parameter(png_warning_parameters p, int number, + png_const_charp string) +{ + if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT) + (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string); +} + +void +png_warning_parameter_unsigned(png_warning_parameters p, int number, int format, + png_alloc_size_t value) +{ + char buffer[PNG_NUMBER_BUFFER_SIZE]; + png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value)); +} + +void +png_warning_parameter_signed(png_warning_parameters p, int number, int format, + png_int_32 value) +{ + png_alloc_size_t u; + png_charp str; + char buffer[PNG_NUMBER_BUFFER_SIZE]; + + /* Avoid overflow by doing the negate in a png_alloc_size_t: */ + u = (png_alloc_size_t)value; + if (value < 0) + u = ~u + 1; + + str = PNG_FORMAT_NUMBER(buffer, format, u); + + if (value < 0 && str > buffer) + *--str = '-'; + + png_warning_parameter(p, number, str); +} + +void +png_formatted_warning(png_structp png_ptr, png_warning_parameters p, + png_const_charp message) +{ + /* The internal buffer is just 128 bytes - enough for all our messages, + * overflow doesn't happen because this code checks! + */ + size_t i; + char msg[128]; + + for (i=0; i<(sizeof msg)-1 && *message != '\0'; ++i) + { + if (*message == '@') + { + int parameter = -1; + switch (*++message) + { + case '1': + parameter = 0; + break; + + case '2': + parameter = 1; + break; + + case '\0': + continue; /* To break out of the for loop above. */ + + default: + break; + } + + if (parameter >= 0 && parameter < PNG_WARNING_PARAMETER_COUNT) + { + /* Append this parameter */ + png_const_charp parm = p[parameter]; + png_const_charp pend = p[parameter] + (sizeof p[parameter]); + + /* No need to copy the trailing '\0' here, but there is no guarantee + * that parm[] has been initialized, so there is no guarantee of a + * trailing '\0': + */ + for (; i<(sizeof msg)-1 && parm != '\0' && parm < pend; ++i) + msg[i] = *parm++; + + ++message; + continue; + } + + /* else not a parameter and there is a character after the @ sign; just + * copy that. + */ + } + + /* At this point *message can't be '\0', even in the bad parameter case + * above where there is a lone '@' at the end of the message string. + */ + msg[i] = *message++; + } + + /* i is always less than (sizeof msg), so: */ + msg[i] = '\0'; + + /* And this is the formatted message: */ + png_warning(png_ptr, msg); +} #endif /* PNG_WARNINGS_SUPPORTED */ #ifdef PNG_BENIGN_ERRORS_SUPPORTED void PNGAPI @@ -271,9 +485,9 @@ if (png_ptr == NULL || jmp_buf_size != png_sizeof(jmp_buf)) return NULL; png_ptr->longjmp_fn = longjmp_fn; - return &png_ptr->png_jmpbuf; + return &png_ptr->longjmp_buffer; } #endif /* This is the default error handling function. Note that replacements for @@ -286,9 +500,10 @@ PNG_NORETURN) { #ifdef PNG_CONSOLE_IO_SUPPORTED #ifdef PNG_ERROR_NUMBERS_SUPPORTED - if (*error_message == PNG_LITERAL_SHARP) + /* Check on NULL only added in 1.5.3 */ + if (error_message != NULL && *error_message == PNG_LITERAL_SHARP) { /* Strip "#nnnn " from beginning of error message. */ int offset; char error_number[16]; @@ -316,13 +531,13 @@ } else #endif { - fprintf(stderr, "libpng error: %s", error_message); + fprintf(stderr, "libpng error: %s", error_message ? error_message : + "undefined"); fprintf(stderr, PNG_STRING_NEWLINE); } -#endif -#ifndef PNG_CONSOLE_IO_SUPPORTED +#else PNG_UNUSED(error_message) /* Make compiler happy */ #endif png_longjmp(png_ptr, 1); } @@ -334,15 +549,15 @@ if (png_ptr && png_ptr->longjmp_fn) { # ifdef USE_FAR_KEYWORD { - jmp_buf png_jmpbuf; - png_memcpy(png_jmpbuf, png_ptr->png_jmpbuf, png_sizeof(jmp_buf)); - png_ptr->longjmp_fn(png_jmpbuf, val); + jmp_buf tmp_jmpbuf; + png_memcpy(tmp_jmpbuf, png_ptr->longjmp_buffer, png_sizeof(jmp_buf)); + png_ptr->longjmp_fn(tmp_jmpbuf, val); } # else - png_ptr->longjmp_fn(png_ptr->png_jmpbuf, val); + png_ptr->longjmp_fn(png_ptr->longjmp_buffer, val); # endif } #endif /* Here if not setjmp support or if png_ptr is null. */ @@ -402,9 +617,9 @@ /* This function is called when the application wants to use another method * of handling errors and warnings. Note that the error function MUST NOT * return to the calling routine or serious problems will occur. The return - * method used in the default routine calls longjmp(png_ptr->png_jmpbuf, 1) + * method used in the default routine calls longjmp(png_ptr->longjmp_buffer, 1) */ void PNGAPI png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn) @@ -413,9 +628,13 @@ return; png_ptr->error_ptr = error_ptr; png_ptr->error_fn = error_fn; +#ifdef PNG_WARNINGS_SUPPORTED png_ptr->warning_fn = warning_fn; +#else + PNG_UNUSED(warning_fn) +#endif } /* This function returns a pointer to the error_ptr associated with the user diff -ru4NwbB libpng-1.5.2/pngmem.c libpng-1.5.3beta06/pngmem.c --- libpng-1.5.2/pngmem.c 2011-03-31 11:23:40.721711366 -0500 +++ libpng-1.5.3beta06/pngmem.c 2011-05-07 21:41:06.915835807 -0500 @@ -1,8 +1,8 @@ /* pngmem.c - stub functions for memory allocation * - * Last changed in libpng 1.5.1 [February 3, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -186,25 +186,34 @@ { int num_blocks; png_uint_32 total_size; png_bytep table; - int i; + int i, mem_level, window_bits; png_byte huge * hptr; + int window_bits if (ret != NULL) { farfree(ret); ret = NULL; } - if (png_ptr->zlib_window_bits > 14) - num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14)); + window_bits = + png_ptr->zlib_window_bits >= png_ptr->zlib_text_window_bits ? + png_ptr->zlib_window_bits : png_ptr->zlib_text_window_bits; + + if (window_bits > 14) + num_blocks = (int)(1 << (window_bits - 14)); else num_blocks = 1; - if (png_ptr->zlib_mem_level >= 7) - num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7)); + mem_level = + png_ptr->zlib_mem_level >= png_ptr->zlib_text_mem_level ? + png_ptr->zlib_mem_level : png_ptr->zlib_text_mem_level; + + if (mem_level >= 7) + num_blocks += (int)(1 << (mem_level - 7)); else num_blocks++; @@ -276,9 +285,9 @@ if (png_ptr->offset_table_count >= png_ptr->offset_table_number) { # ifndef PNG_USER_MEM_SUPPORTED if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out of Memory"); /* Note "o" and "M" */ + png_error(png_ptr, "Out of Memory"); /* Note "O" and "M" */ else png_warning(png_ptr, "Out of Memory"); # endif diff -ru4NwbB libpng-1.5.2/pngpread.c libpng-1.5.3beta06/pngpread.c --- libpng-1.5.2/pngpread.c 2011-03-31 11:23:40.730867797 -0500 +++ libpng-1.5.3beta06/pngpread.c 2011-05-07 21:41:06.924724110 -0500 @@ -1025,10 +1025,12 @@ (int)(png_ptr->row_buf[0])); png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); +#ifdef PNG_READ_TRANSFORMS_SUPPORTED if (png_ptr->transformations) png_do_read_transformations(png_ptr); +#endif #ifdef PNG_READ_INTERLACING_SUPPORTED /* Blow up interlaced rows to full size */ if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) diff -ru4NwbB libpng-1.5.2/pngpriv.h libpng-1.5.3beta06/pngpriv.h --- libpng-1.5.2/pngpriv.h 2011-03-31 11:23:40.667851883 -0500 +++ libpng-1.5.3beta06/pngpriv.h 2011-05-07 21:41:06.862117023 -0500 @@ -5,9 +5,9 @@ * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * - * Last changed in libpng 1.5.2 [March 31, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer * and license in png.h @@ -24,8 +24,22 @@ #ifndef PNGPRIV_H #define PNGPRIV_H +/* Feature Test Macros. The following are defined here to ensure that correctly + * implemented libraries reveal the APIs libpng needs to build and hide those + * that are not needed and potentially damaging to the compilation. + * + * Feature Test Macros must be defined before any system header is included (see + * POSIX 1003.1 2.8.2 "POSIX Symbols." + * + * These macros only have an effect if the operating system supports either + * POSIX 1003.1 or C99, or both. On other operating systems (particularly + * Windows/Visual Studio) there is no effect; the OS specific tests below are + * still required (as of 2011-05-02.) + */ +#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ + /* This is required for the definition of abort(), used as a last ditch * error handler when all else fails. */ #include @@ -100,14 +114,22 @@ # undef PNG_ZBUF_SIZE # define PNG_ZBUF_SIZE 65536L #endif -/* If warnings or errors are turned off the code is disabled - * or redirected here. +/* If warnings or errors are turned off the code is disabled or redirected here. + * From 1.5.3 functions have been added to allow very limited formatting of + * error and warning messages - this code will also be disabled here. */ -#ifndef PNG_WARNINGS_SUPPORTED -# define png_warning(s1,s2) ((void)0) -# define png_chunk_warning(s1,s2) ((void)0) +#ifdef PNG_WARNINGS_SUPPORTED +# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; +#else +# define png_warning(s1,s2) ((void)(s1)) +# define png_chunk_warning(s1,s2) ((void)(s1)) +# define png_warning_parameter(p,number,string) ((void)0) +# define png_warning_parameter_unsigned(p,number,format,value) ((void)0) +# define png_warning_parameter_signed(p,number,format,value) ((void)0) +# define png_formatted_warning(pp,p,message) ((void)(pp)) +# define PNG_WARNING_PARAMETERS(p) #endif #ifndef PNG_ERROR_TEXT_SUPPORTED # define png_error(s1,s2) png_err(s1) # define png_chunk_error(s1,s2) png_err(s1) @@ -230,31 +252,8 @@ # define png_sprintf sprintf # endif #endif /* End of memory model/platform independent support */ - -#ifndef PNG_NO_SNPRINTF -# ifdef _MSC_VER -# define png_snprintf _snprintf /* Added to v 1.2.19 */ -# define png_snprintf2 _snprintf -# define png_snprintf6 _snprintf -# else -# define png_snprintf snprintf /* Added to v 1.2.19 */ -# define png_snprintf2 snprintf -# define png_snprintf6 snprintf -# endif -#else - /* You don't have or don't want to use snprintf(). Caution: Using - * sprintf instead of snprintf exposes your application to accidental - * or malevolent buffer overflows. If you don't have snprintf() - * as a general rule you should provide one (you can get one from - * Portable OpenSSH). - */ -# define png_snprintf(s1,n,fmt,x1) png_sprintf(s1,fmt,x1) -# define png_snprintf2(s1,n,fmt,x1,x2) png_sprintf(s1,fmt,x1,x2) -# define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \ - png_sprintf(s1,fmt,x1,x2,x3,x4,x5,x6) -#endif /* End of 1.5.0beta36 move from pngconf.h */ /* CONSTANTS and UTILITY MACROS * These are used internally by libpng and not exposed in the API @@ -285,9 +284,9 @@ #define PNG_SHIFT 0x0008 #define PNG_SWAP_BYTES 0x0010 #define PNG_INVERT_MONO 0x0020 #define PNG_QUANTIZE 0x0040 -#define PNG_BACKGROUND 0x0080 +#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ #define PNG_BACKGROUND_EXPAND 0x0100 #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ #define PNG_16_TO_8 0x0400 #define PNG_RGBA 0x0800 @@ -302,9 +301,9 @@ #define PNG_USER_TRANSFORM 0x100000L #define PNG_RGB_TO_GRAY_ERR 0x200000L #define PNG_RGB_TO_GRAY_WARN 0x400000L #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ - /* 0x800000L Unused */ +#define PNG_ENCODE_ALPHA 0x800000L /* Added to libpng-1.5.3 */ #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ /* 0x4000000L unused */ /* 0x8000000L unused */ @@ -332,11 +331,11 @@ #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 - /* 0x1000 unused */ - /* 0x2000 unused */ - /* 0x4000 unused */ +#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.3 */ +#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.3 */ +#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.3 */ #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L @@ -344,13 +343,13 @@ #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L /* 0x200000L unused */ /* 0x400000L unused */ #define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */ - /* 0x1000000L unused */ - /* 0x2000000L unused */ - /* 0x4000000L unused */ - /* 0x8000000L unused */ - /* 0x10000000L unused */ +#define PNG_FLAG_ZTXT_CUSTOM_STRATEGY 0x1000000L /* 5 lines added */ +#define PNG_FLAG_ZTXT_CUSTOM_LEVEL 0x2000000L /* to libpng-1.5.3 */ +#define PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL 0x4000000L +#define PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS 0x8000000L +#define PNG_FLAG_ZTXT_CUSTOM_METHOD 0x10000000L /* 0x20000000L unused */ /* 0x40000000L unused */ #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ @@ -471,8 +470,14 @@ * functionality in libpng. More information about most functions can * be found in the files where the functions are located. */ +/* Check the user version string for compatibility, returns false if the version + * numbers aren't compatible. + */ +PNG_EXTERN int png_user_version_check(png_structp png_ptr, + png_const_charp user_png_ver); + /* Allocate memory for an internal libpng struct */ PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)), PNG_ALLOCATED); @@ -539,10 +544,9 @@ PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, png_size_t length)); /* Decompress data in a chunk that uses compression */ -#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ - defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) +#if defined(PNG_READ_COMPRESSED_TEXT_SUPPORTED) PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, int comp_type, png_size_t chunklength, png_size_t prefix_length, png_size_t *data_length)); #endif @@ -643,8 +647,9 @@ PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_const_uint_16p hist, int num_hist)); #endif +/* Chunks that have keywords */ #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, png_const_charp key, png_charpp new_key)); @@ -733,19 +738,19 @@ /* Choose the best filter to use and filter the row data */ PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, png_row_infop row_info)); -/* Write out the filtered row. */ -PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, - png_bytep filtered_row)); /* Finish a row while reading, dealing with interlacing passes, etc. */ PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); /* Initialize the row buffers, etc. */ PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); + +#ifdef PNG_READ_TRANSFORMS_SUPPORTED /* Optional call to update the users info structure */ PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, png_infop info_ptr)); +#endif /* These are the functions that do the transformations */ #ifdef PNG_READ_FILLER_SUPPORTED PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, @@ -846,28 +851,22 @@ PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, png_const_color_8p bit_depth)); #endif -#ifdef PNG_READ_BACKGROUND_SUPPORTED -# ifdef PNG_READ_GAMMA_SUPPORTED -PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, - png_bytep row, png_const_color_16p trans_color, - png_const_color_16p background, png_const_color_16p background_1, - png_const_bytep gamma_table, png_const_bytep gamma_from_1, - png_const_bytep gamma_to_1, png_const_uint_16pp gamma_16, - png_const_uint_16pp gamma_16_from_1, png_const_uint_16pp gamma_16_to_1, - int gamma_shift)); -# else -PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, - png_bytep row, png_const_color_16p trans_color, - png_const_color_16p background)); -# endif +#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) +PNG_EXTERN void png_do_compose PNGARG((png_row_infop row_info, + png_bytep row, png_structp png_ptr)); #endif #ifdef PNG_READ_GAMMA_SUPPORTED PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, - png_bytep row, png_const_bytep gamma_table, - png_const_uint_16pp gamma_16_table, int gamma_shift)); + png_bytep row, png_structp png_ptr)); +#endif + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED +PNG_EXTERN void png_do_encode_alpha PNGARG((png_row_infop row_info, + png_bytep row, png_structp png_ptr)); #endif #ifdef PNG_READ_EXPAND_SUPPORTED PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, @@ -985,12 +984,18 @@ PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, png_const_bytep chunk_name)); /* Handle the transformations for reading and writing */ +#ifdef PNG_READ_TRANSFORMS_SUPPORTED PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); +#endif +#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); +#endif +#ifdef PNG_READ_TRANSFORMS_SUPPORTED PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); +#endif #ifdef PNG_PROGRESSIVE_READ_SUPPORTED PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, png_infop info_ptr)); @@ -1085,8 +1090,78 @@ PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr, png_const_charp name),PNG_NORETURN); #endif +/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite + * the end. Always leaves the buffer nul terminated. Never errors out (and + * there is no error code.) + */ +PNG_EXTERN size_t png_safecat(png_charp buffer, size_t bufsize, size_t pos, + png_const_charp string); + +/* Various internal functions to handle formatted warning messages, currently + * only implemented for warnings. + */ +#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) +/* Utility to dump an unsigned value into a buffer, given a start pointer and + * and end pointer (which should point just *beyond* the end of the buffer!) + * Returns the pointer to the start of the formatted string. This utility only + * does unsigned values. + */ +PNG_EXTERN png_charp png_format_number(png_const_charp start, png_charp end, + int format, png_alloc_size_t number); + +/* Convenience macro that takes an array: */ +#define PNG_FORMAT_NUMBER(buffer,format,number) \ + png_format_number(buffer, buffer + (sizeof buffer), format, number) + +/* Suggested size for a number buffer (enough for 64 bits and a sign!) */ +#define PNG_NUMBER_BUFFER_SIZE 24 + +/* These are the integer formats currently supported, the name is formed from + * the standard printf(3) format string. + */ +#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ +#define PNG_NUMBER_FORMAT_02u 2 +#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ +#define PNG_NUMBER_FORMAT_02d 2 +#define PNG_NUMBER_FORMAT_x 3 +#define PNG_NUMBER_FORMAT_02x 4 +#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ +#endif + +#ifdef PNG_WARNINGS_SUPPORTED +/* New defines and members adding in libpng-1.5.3 */ +# define PNG_WARNING_PARAMETER_SIZE 32 +# define PNG_WARNING_PARAMETER_COUNT 8 + +/* An l-value of this type has to be passed to the APIs below to cache the + * values of the parameters to a formatted warning message. + */ +typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ + PNG_WARNING_PARAMETER_SIZE]; + +PNG_EXTERN void png_warning_parameter(png_warning_parameters p, int number, + png_const_charp string); + /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, + * including the trailing '\0'. + */ +PNG_EXTERN void png_warning_parameter_unsigned(png_warning_parameters p, + int number, int format, png_alloc_size_t value); + /* Use png_alloc_size_t because it is an unsigned type as big as any we + * need to output. Use the following for a signed value. + */ +PNG_EXTERN void png_warning_parameter_signed(png_warning_parameters p, + int number, int format, png_int_32 value); + +PNG_EXTERN void png_formatted_warning(png_structp png_ptr, + png_warning_parameters p, png_const_charp message); + /* 'message' follows the X/Open approach of using @1, @2 to insert + * parameters previously supplied using the above functions. Errors in + * specifying the paramters will simple result in garbage substitutions. + */ +#endif + /* ASCII to FP interfaces, currently only implemented if sCAL * support is required. */ #if defined(PNG_READ_sCAL_SUPPORTED) diff -ru4NwbB libpng-1.5.2/pngread.c libpng-1.5.3beta06/pngread.c --- libpng-1.5.2/pngread.c 2011-03-31 11:23:40.738999129 -0500 +++ libpng-1.5.3beta06/pngread.c 2011-05-07 21:41:06.932820640 -0500 @@ -1,8 +1,8 @@ /* pngread.c - read a PNG file * - * Last changed in libpng 1.5.2 [March 31, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -46,14 +46,12 @@ volatile int png_cleanup_needed = 0; #ifdef PNG_SETJMP_SUPPORTED #ifdef USE_FAR_KEYWORD - jmp_buf png_jmpbuf; + jmp_buf tmp_jmpbuf; #endif #endif - int i; - png_debug(1, "in png_create_read_struct"); #ifdef PNG_USER_MEM_SUPPORTED png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, @@ -84,15 +82,15 @@ /* Applications that neglect to set up their own setjmp() and then encounter a png_error() will longjmp here. Since the jmpbuf is then meaningless we abort instead of returning. */ #ifdef USE_FAR_KEYWORD - if (setjmp(png_jmpbuf)) + if (setjmp(tmp_jmpbuf)) #else if (setjmp(png_jmpbuf(png_ptr))) /* Sets longjmp to match setjmp */ #endif PNG_ABORT(); #ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(png_ptr), png_jmpbuf, png_sizeof(jmp_buf)); + png_memcpy(png_jmpbuf(png_ptr), tmp_jmpbuf, png_sizeof(jmp_buf)); #endif #endif /* PNG_SETJMP_SUPPORTED */ #ifdef PNG_USER_MEM_SUPPORTED @@ -100,56 +98,11 @@ #endif png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); - if (user_png_ver) - { - i = 0; - - do - { - if (user_png_ver[i] != png_libpng_ver[i]) - png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; - } while (png_libpng_ver[i++]); - } - - else - png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; - - - if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) - { - /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so - * we must recompile any applications that use any older library version. - * For versions after libpng 1.0, we will be compatible, so we need - * only check the first digit. - */ - if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || - (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || - (user_png_ver[0] == '0' && user_png_ver[2] < '9')) - { -#ifdef PNG_CONSOLE_IO_SUPPORTED - char msg[80]; - if (user_png_ver) - { - png_snprintf2(msg, 80, - "Application built with libpng-%.20s" - " but running with %.20s", - user_png_ver, - png_libpng_ver); - png_warning(png_ptr, msg); - } -#else - png_warning(png_ptr, - "Incompatible libpng version in application and library"); -#endif -#ifdef PNG_ERROR_NUMBERS_SUPPORTED - png_ptr->flags = 0; -#endif - + /* Call the general version checker (shared with read and write code): */ + if (!png_user_version_check(png_ptr, user_png_ver)) png_cleanup_needed = 1; - } - } if (!png_cleanup_needed) { /* Initialize zbuf - compression buffer */ @@ -456,9 +409,13 @@ png_warning(png_ptr, "Ignoring extra png_read_update_info() call;" " row buffer not reallocated"); +#ifdef PNG_READ_TRANSFORMS_SUPPORTED png_read_transform_info(png_ptr, info_ptr); +#else + PNG_UNUSED(info_ptr) +#endif } #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Initialize palette, background, etc, after transformations @@ -703,10 +660,12 @@ } #endif +#ifdef PNG_READ_TRANSFORMS_SUPPORTED if (png_ptr->transformations) png_do_read_transformations(png_ptr); +#endif #ifdef PNG_READ_INTERLACING_SUPPORTED /* Blow up interlaced rows to full size */ if (png_ptr->interlaced && @@ -1162,9 +1121,11 @@ #ifdef PNG_SETJMP_SUPPORTED jmp_buf tmp_jmp; #endif png_error_ptr error_fn; +#ifdef PNG_WARNINGS_SUPPORTED png_error_ptr warning_fn; +#endif png_voidp error_ptr; #ifdef PNG_USER_MEM_SUPPORTED png_free_ptr free_fn; #endif @@ -1248,12 +1209,8 @@ } #endif #endif -#ifdef PNG_TIME_RFC1123_SUPPORTED - png_free(png_ptr, png_ptr->time_buffer); -#endif - inflateEnd(&png_ptr->zstream); #ifdef PNG_PROGRESSIVE_READ_SUPPORTED png_free(png_ptr, png_ptr->save_buffer); @@ -1268,29 +1225,33 @@ /* Save the important info out of the png_struct, in case it is * being used again. */ #ifdef PNG_SETJMP_SUPPORTED - png_memcpy(tmp_jmp, png_ptr->png_jmpbuf, png_sizeof(jmp_buf)); + png_memcpy(tmp_jmp, png_ptr->longjmp_buffer, png_sizeof(jmp_buf)); #endif error_fn = png_ptr->error_fn; +#ifdef PNG_WARNINGS_SUPPORTED warning_fn = png_ptr->warning_fn; +#endif error_ptr = png_ptr->error_ptr; #ifdef PNG_USER_MEM_SUPPORTED free_fn = png_ptr->free_fn; #endif png_memset(png_ptr, 0, png_sizeof(png_struct)); png_ptr->error_fn = error_fn; +#ifdef PNG_WARNINGS_SUPPORTED png_ptr->warning_fn = warning_fn; +#endif png_ptr->error_ptr = error_ptr; #ifdef PNG_USER_MEM_SUPPORTED png_ptr->free_fn = free_fn; #endif #ifdef PNG_SETJMP_SUPPORTED - png_memcpy(png_ptr->png_jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); + png_memcpy(png_ptr->longjmp_buffer, tmp_jmp, png_sizeof(jmp_buf)); #endif } diff -ru4NwbB libpng-1.5.2/pngrtran.c libpng-1.5.3beta06/pngrtran.c --- libpng-1.5.2/pngrtran.c 2011-03-31 11:23:40.759414573 -0500 +++ libpng-1.5.3beta06/pngrtran.c 2011-05-07 21:41:06.954606044 -0500 @@ -1,8 +1,8 @@ /* pngrtran.c - transforms the data in a row for PNG readers * - * Last changed in libpng 1.5.2 [March 31, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -105,14 +105,20 @@ png_warning(png_ptr, "Application must supply a known background gamma"); return; } - png_ptr->transformations |= PNG_BACKGROUND; + png_ptr->transformations |= PNG_COMPOSE | PNG_STRIP_ALPHA; + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + png_memcpy(&(png_ptr->background), background_color, png_sizeof(png_color_16)); png_ptr->background_gamma = background_gamma; png_ptr->background_gamma_type = (png_byte)(background_gamma_code); - png_ptr->transformations |= (need_expand ? PNG_BACKGROUND_EXPAND : 0); + if (need_expand) + png_ptr->transformations |= PNG_BACKGROUND_EXPAND; + else + png_ptr->transformations &= ~PNG_BACKGROUND_EXPAND; } # ifdef PNG_FLOATING_POINT_SUPPORTED void PNGAPI @@ -136,9 +142,8 @@ if (png_ptr == NULL) return; png_ptr->transformations |= PNG_16_TO_8; - png_ptr->transformations &= ~PNG_EXPAND_16; } #endif #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED @@ -153,8 +158,152 @@ png_ptr->transformations |= PNG_STRIP_ALPHA; } #endif +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED +void PNGFAPI +png_set_alpha_mode_fixed(png_structp png_ptr, int mode, + png_fixed_point output_gamma) +{ + int compose = 0; + png_fixed_point file_gamma; + + png_debug(1, "in png_set_alpha_mode"); + + if (png_ptr == NULL) + return; + + /* If the default_gamma value is 0 then switch on the whole sRGB + * edifice by this flag (note: this is a flag to the later code, + * not a transformation!) + */ + if (output_gamma == PNG_DEFAULT_sRGB) + { + /* If there is no sRGB support this just sets the gamma to the standard + * sRGB value. + */ +# ifdef PNG_READ_sRGB_SUPPORTED + png_ptr->flags |= PNG_FLAG_ASSUME_sRGB; +# endif + output_gamma = PNG_GAMMA_sRGB; + } + + /* Else validate the value to ensure it is in a reasonable range, the value + * is expected to be 1 or greater, but this range test allows for some + * viewing correction values. The intent is to weed out users of this API + * who use the inverse of the gamma value accidentally! Since some of these + * values are reasonable this may have to be changed. + */ + else if (output_gamma < 70000 || output_gamma > 300000) + png_error(png_ptr, "output gamma out of expected range"); + + /* The default file gamma is the inverse of the output gamma; the output + * gamma may be changed below so get the file value first: + */ + file_gamma = png_reciprocal(output_gamma); + + /* There are really 8 possibilities here, composed of any combination + * of: + * + * premultiply the color channels + * do not encode non-opaque pixels + * encode the alpha as well as the color channels + * + * The differences disappear if the input/output ('screen') gamma is 1.0, + * because then the encoding is a no-op and there is only the choice of + * premultiplying the color channels or not. + * + * png_set_alpha_mode and png_set_background interact because both use + * png_compose to do the work. Calling both is only useful when + * png_set_alpha_mode is used to set the default mode - PNG_ALPHA_PNG - along + * with a default gamma value. Otherwise PNG_COMPOSE must not be set. + */ + switch (mode) + { + case PNG_ALPHA_PNG: /* default: png standard */ + /* No compose, but it may be set by png_set_background! */ + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + break; + + case PNG_ALPHA_ASSOCIATED: /* color channels premultiplied */ + compose = 1; + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + /* The output is linear: */ + output_gamma = PNG_FP_1; + break; + + case PNG_ALPHA_OPTIMIZED: /* associated, non-opaque pixels linear */ + compose = 1; + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags |= PNG_FLAG_OPTIMIZE_ALPHA; + /* output_gamma records the encoding of opaque pixels! */ + break; + + case PNG_ALPHA_BROKEN: /* associated, non-linear, alpha encoded */ + compose = 1; + png_ptr->transformations |= PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + break; + + default: + png_error(png_ptr, "invalid alpha mode"); + } + + /* Only set the default gamma if the file gamma has not been set (this has + * the side effect that the gamma in a second call to png_set_alpha_mode will + * be ignored.) + */ + if (png_ptr->gamma == 0) + png_ptr->gamma = file_gamma; + + /* But always set the output gamma: */ + png_ptr->screen_gamma = output_gamma; + + /* Finally, if pre-multiplying, set the background fields to achieve the + * desired result. + */ + if (compose) + { + /* And obtain alpha pre-multiplication by composing on black: */ + png_memset(&png_ptr->background, 0, sizeof png_ptr->background); + png_ptr->background_gamma = png_ptr->gamma; /* just in case */ + png_ptr->background_gamma_type = PNG_BACKGROUND_GAMMA_FILE; + png_ptr->transformations &= ~PNG_BACKGROUND_EXPAND; + + if (png_ptr->transformations & PNG_COMPOSE) + png_error(png_ptr, + "conflicting calls to set alpha mode and background"); + + png_ptr->transformations |= PNG_COMPOSE; + } + + /* New API, make sure apps call the correct initializers: */ + png_ptr->flags |= PNG_FLAG_DETECT_UNINITIALIZED; +} + +# ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_alpha_mode(png_structp png_ptr, int mode, double output_gamma) +{ + /* The following silently ignores cases where fixed point (times 100,000) + * gamma values are passed to the floating point API. This is safe and it + * means the fixed point constants work just fine with the floating point + * API. The alternative would just lead to undetected errors and spurious + * bug reports. Negative values fail inside the _fixed API. + */ + if (output_gamma > -128 && output_gamma < 128) + output_gamma *= PNG_FP_1; + + if (output_gamma <= PNG_FP_MAX && output_gamma >= PNG_FP_MIN) + png_set_alpha_mode_fixed(png_ptr, mode, (png_fixed_point)output_gamma); + else + png_fixed_error(png_ptr, "png_set_alpha_mode gamma"); +} +# endif +#endif + #ifdef PNG_READ_QUANTIZE_SUPPORTED /* Dither file to 8 bit. Supply a palette, the current number * of elements in the palette, the maximum number of elements * allowed, and a histogram if possible. If the current number @@ -560,32 +709,8 @@ } #endif /* PNG_READ_QUANTIZE_SUPPORTED */ #ifdef PNG_READ_GAMMA_SUPPORTED -/* Transform the image from the file_gamma to the screen_gamma. We - * only do transformations on images where the file_gamma and screen_gamma - * are not close reciprocals, otherwise it slows things down slightly, and - * also needlessly introduces small errors. - * - * We will turn off gamma transformation later if no semitransparent entries - * are present in the tRNS array for palette images. We can't do it here - * because we don't necessarily have the tRNS chunk yet. - */ -static int /* PRIVATE */ -png_gamma_threshold(png_fixed_point scrn_gamma, png_fixed_point file_gamma) -{ - /* PNG_GAMMA_THRESHOLD is the threshold for performing gamma - * correction as a difference of the overall transform from 1.0 - * - * We want to compare the threshold with s*f - 1, if we get - * overflow here it is because of wacky gamma values so we - * turn on processing anyway. - */ - png_fixed_point gtest; - return !png_muldiv(>est, scrn_gamma, file_gamma, PNG_FP_1) || - png_gamma_significant(gtest); -} - void PNGFAPI png_set_gamma_fixed(png_structp png_ptr, png_fixed_point scrn_gamma, png_fixed_point file_gamma) { @@ -593,12 +718,30 @@ if (png_ptr == NULL) return; - if ((png_ptr->color_type & PNG_COLOR_MASK_ALPHA) || - (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || - png_gamma_threshold(scrn_gamma, file_gamma)) - png_ptr->transformations |= PNG_GAMMA; +#if PNG_LIBPNG_VER >= 10600 + /* Checking the gamma values for being >0 was added in 1.5.3 along with the + * premultiplied alpha support; this actually hides an undocumented feature + * of the previous implementation which allowed gamma processing to be + * disabled in background handling. There is no evidence (so far) that this + * was being used, however png_set_background itself accepted and must still + * accept '0' for the gamma value it takes, because it isn't always used. + * + * Since this is an API change (albeit a very minor one that removes an + * undocumented API feature) it will only be made in 1.6. + */ + if (file_gamma <= 0) + png_error("invalid file gamma to png_set_gamma"); + + if (scrn_gamma <= 0) + png_error("invalid screen gamma to png_set_gamma"); +#endif + + /* Set the gamma values unconditionally - this overrides the value in the PNG + * file if a gAMA chunk was present. png_set_alpha_mode provides a + * different, easier, way to default the file gamma. + */ png_ptr->gamma = file_gamma; png_ptr->screen_gamma = scrn_gamma; } @@ -699,11 +842,12 @@ if (png_ptr == NULL) return; png_ptr->transformations |= (PNG_EXPAND_16 | PNG_EXPAND | PNG_EXPAND_tRNS); - png_ptr->transformations &= ~PNG_16_TO_8; - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; + + /* New API, make sure apps call the correct initializers: */ + png_ptr->flags |= PNG_FLAG_DETECT_UNINITIALIZED; } #endif #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED @@ -826,57 +970,162 @@ #endif } #endif +#ifdef PNG_READ_TRANSFORMS_SUPPORTED +#ifdef PNG_READ_GAMMA_SUPPORTED +/* In the case of gamma transformations only do transformations on images where + * the [file] gamma and screen_gamma are not close reciprocals, otherwise it + * slows things down slightly, and also needlessly introduces small errors. + */ +static int /* PRIVATE */ +png_gamma_threshold(png_fixed_point screen_gamma, png_fixed_point file_gamma) +{ + /* PNG_GAMMA_THRESHOLD is the threshold for performing gamma + * correction as a difference of the overall transform from 1.0 + * + * We want to compare the threshold with s*f - 1, if we get + * overflow here it is because of wacky gamma values so we + * turn on processing anyway. + */ + png_fixed_point gtest; + return !png_muldiv(>est, screen_gamma, file_gamma, PNG_FP_1) || + png_gamma_significant(gtest); +} +#endif + /* Initialize everything needed for the read. This includes modifying * the palette. */ -void /* PRIVATE */ -png_init_read_transformations(png_structp png_ptr) + +/*For the moment 'png_init_palette_transformations' and + * 'png_init_rgb_transformations' only do some flag canceling optimizations. + * The intent is that these two routines should have palette or rgb operations + * extracted from 'png_init_read_transformations'. + */ +static void /* PRIVATE */ +png_init_palette_transformations(png_structp png_ptr) +{ + /* Called to handle the (input) palette case. In png_do_read_transformations + * the first step is to expand the palette if requested, so this code must + * take care to only make changes that are invariant with respect to the + * palette expansion, or only do them if there is no expansion. + * + * STRIP_ALPHA has already been handled in the caller (by setting num_trans + * to 0.) + */ + int input_has_alpha = 0; + int input_has_transparency = 0; + + if (png_ptr->num_trans > 0) { - png_debug(1, "in png_init_read_transformations"); + int i; + /* Ignore if all the entries are opaque (unlikely!) */ + for (i=0; inum_trans; ++i) + if (png_ptr->trans_alpha[i] == 255) + continue; + else if (png_ptr->trans_alpha[i] == 0) + input_has_transparency = 1; + else + input_has_alpha = 1; + } + + /* If no alpha we can optimize. */ + if (!input_has_alpha) { -#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ - defined(PNG_READ_SHIFT_SUPPORTED) || \ - defined(PNG_READ_GAMMA_SUPPORTED) - int color_type = png_ptr->color_type; -#endif + /* Any alpha means background and associative alpha processing is + * required, however if the alpha is 0 or 1 throughout OPTIIMIZE_ALPHA + * and ENCODE_ALPHA are irrelevant. + */ + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + + if (!input_has_transparency) + png_ptr->transformations &= ~(PNG_COMPOSE | PNG_BACKGROUND_EXPAND); + } #if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED) + /* png_set_background handling - deals with the complexity of whether the + * background color is in the file format or the screen format in the case + * where an 'expand' will happen. + */ -#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED - /* Detect gray background and attempt to enable optimization - * for gray --> RGB case - * - * Note: if PNG_BACKGROUND_EXPAND is set and color_type is either RGB or - * RGB_ALPHA (in which case need_expand is superfluous anyway), the - * background color might actually be gray yet not be flagged as such. - * This is not a problem for the current code, which uses - * PNG_BACKGROUND_IS_GRAY only to decide when to do the - * png_do_gray_to_rgb() transformation. + /* The following code cannot be entered in the alpha pre-multiplication case + * because PNG_BACKGROUND_EXPAND is cancelled below. */ if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) && - !(color_type & PNG_COLOR_MASK_COLOR)) + (png_ptr->transformations & PNG_EXPAND)) { - png_ptr->mode |= PNG_BACKGROUND_IS_GRAY; - } + { + png_ptr->background.red = + png_ptr->palette[png_ptr->background.index].red; + png_ptr->background.green = + png_ptr->palette[png_ptr->background.index].green; + png_ptr->background.blue = + png_ptr->palette[png_ptr->background.index].blue; - else if ((png_ptr->transformations & PNG_BACKGROUND) && - !(png_ptr->transformations & PNG_BACKGROUND_EXPAND) && - (png_ptr->transformations & PNG_GRAY_TO_RGB) && - png_ptr->background.red == png_ptr->background.green && - png_ptr->background.red == png_ptr->background.blue) +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED + if (png_ptr->transformations & PNG_INVERT_ALPHA) { - png_ptr->mode |= PNG_BACKGROUND_IS_GRAY; - png_ptr->background.gray = png_ptr->background.red; + if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) + { + /* Invert the alpha channel (in tRNS) unless the pixels are + * going to be expanded, in which case leave it for later + */ + int i, istop = png_ptr->num_trans; + + for (i=0; itrans_alpha[i] = (png_byte)(255 - + png_ptr->trans_alpha[i]); } + } +#endif /* PNG_READ_INVERT_ALPHA_SUPPORTED */ + } + } /* background expand and (therefore) no alpha association. */ +#endif /* PNG_READ_EXPAND_SUPPORTED && PNG_READ_BACKGROUND_SUPPORTED */ +} + +static void /* PRIVATE */ +png_init_rgb_transformations(png_structp png_ptr) +{ + /* Added to libpng-1.5.3: check the color type to determine whether there + * is any alpha or transparency in the image and simply cancel the + * background and alpha mode stuff if there isn't. + */ + int input_has_alpha = (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0; + int input_has_transparency = png_ptr->num_trans > 0; + + /* If no alpha we can optimize. */ + if (!input_has_alpha) + { + /* Any alpha means background and associative alpha processing is + * required, however if the alpha is 0 or 1 throughout OPTIIMIZE_ALPHA + * and ENCODE_ALPHA are irrelevant. + */ +# ifdef PNG_READ_ALPHA_MODE_SUPPORTED + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; #endif + if (!input_has_transparency) + png_ptr->transformations &= ~(PNG_COMPOSE | PNG_BACKGROUND_EXPAND); + } + +#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED) + /* png_set_background handling - deals with the complexity of whether the + * background color is in the file format or the screen format in the case + * where an 'expand' will happen. + */ + + /* The following code cannot be entered in the alpha pre-multiplication case + * because PNG_BACKGROUND_EXPAND is cancelled below. + */ if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) && - (png_ptr->transformations & PNG_EXPAND)) + (png_ptr->transformations & PNG_EXPAND) && + !(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) + /* i.e., GRAY or GRAY_ALPHA */ { - if (!(color_type & PNG_COLOR_MASK_COLOR)) /* i.e., GRAY or GRAY_ALPHA */ { /* Expand background and tRNS chunks */ switch (png_ptr->bit_depth) { @@ -925,70 +1174,259 @@ = png_ptr->background.blue = png_ptr->background.gray; break; } } - else if (color_type == PNG_COLOR_TYPE_PALETTE) + } /* background expand and (therefore) no alpha association. */ +#endif /* PNG_READ_EXPAND_SUPPORTED && PNG_READ_BACKGROUND_SUPPORTED */ +} + +void /* PRIVATE */ +png_init_read_transformations(png_structp png_ptr) { - png_ptr->background.red = - png_ptr->palette[png_ptr->background.index].red; - png_ptr->background.green = - png_ptr->palette[png_ptr->background.index].green; - png_ptr->background.blue = - png_ptr->palette[png_ptr->background.index].blue; + png_debug(1, "in png_init_read_transformations"); -#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED - if (png_ptr->transformations & PNG_INVERT_ALPHA) + /* This internal function is called from png_read_start_row in pngrutil.c + * and it is called before the 'rowbytes' calculation is done, so the code + * in here can change or update the transformations flags. + * + * First do updates that do not depend on the details of the PNG image data + * being processed. + */ + +#ifdef PNG_READ_GAMMA_SUPPORTED + /* Prior to 1.5.3 these tests were performed from png_set_gamma, 1.5.3 adds + * png_set_alpha_mode and this is another source for a default file gamma so + * the test needs to be performed later - here. In addition prior to 1.5.3 + * the tests were repeated for the PALETTE color type here - this is no + * longer necessary (and doesn't seem to have been necessary before.) + */ { -#ifdef PNG_READ_EXPAND_SUPPORTED - if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) -#endif + /* The following temporary indicates if overall gamma correction is + * required. + */ + int gamma_correction = 0; + + if (png_ptr->gamma != 0) /* has been set */ { - /* Invert the alpha channel (in tRNS) unless the pixels are - * going to be expanded, in which case leave it for later + if (png_ptr->screen_gamma != 0) /* screen set too */ + gamma_correction = png_gamma_threshold(png_ptr->gamma, + png_ptr->screen_gamma); + + else + /* Assume the output matches the input; a long time default behavior + * of libpng, although the standard has nothing to say about this. */ - int i, istop; - istop=(int)png_ptr->num_trans; - for (i=0; itrans_alpha[i] = (png_byte)(255 - - png_ptr->trans_alpha[i]); + png_ptr->screen_gamma = png_reciprocal(png_ptr->gamma); } + + else if (png_ptr->screen_gamma != 0) + /* The converse - assume the file matches the screen, note that this + * perhaps undesireable default can (from 1.5.3) be changed by calling + * png_set_alpha_mode (even if the alpha handling mode isn't required + * or isn't changed from the default.) + */ + png_ptr->gamma = png_reciprocal(png_ptr->screen_gamma); + + else /* neither are set */ + /* Just in case the following prevents any processing - file and screen + * are both assumed to be linear and there is no way to introduce a + * third gamma value other than png_set_background with 'UNIQUE', and, + * prior to 1.5.3 + */ + png_ptr->screen_gamma = png_ptr->gamma = PNG_FP_1; + + /* Now turn the gamma transformation on or off as appropriate. Notice + * that PNG_GAMMA just refers to the file->screen correction. Alpha + * composition may independently cause gamma correction because it needs + * linear data (e.g. if the file has a gAMA chunk but the screen gamma + * hasn't been specified.) In any case this flag may get turned off in + * the code immediately below if the transform can be handled outside the + * row loop. + */ + if (gamma_correction) + png_ptr->transformations |= PNG_GAMMA; + + else + png_ptr->transformations &= ~PNG_GAMMA; } #endif + /* Certain transformations have the effect of preventing other + * transformations that happen afterward in png_do_read_transformations, + * resolve the interdependencies here. From the code of + * png_do_read_transformations the order is: + * + * 1) PNG_EXPAND (including PNG_EXPAND_tRNS) + * 2) PNG_STRIP_ALPHA (if no compose) + * 3) PNG_RGB_TO_GRAY + * 4) PNG_GRAY_TO_RGB iff !PNG_BACKGROUND_IS_GRAY + * 5) PNG_COMPOSE + * 6) PNG_GAMMA + * 7) PNG_STRIP_ALPHA (if compose) + * 8) PNG_ENCODE_ALPHA + * 9) PNG_16_TO_8 (strip16) + * 10) PNG_QUANTIZE (converts to palette) + * 11) PNG_EXPAND_16 [NOTE: temporarily moved to (3) for accuracy!] + * 12) PNG_GRAY_TO_RGB iff PNG_BACKGROUND_IS_GRAY + * 13) PNG_INVERT_MONO + * 14) PNG_SHIFT + * 15) PNG_PACK + * 16) PNG_BGR + * 17) PNG_PACKSWAP + * 18) PNG_FILLER (includes PNG_ADD_ALPHA) + * 19) PNG_INVERT_ALPHA + * 20) PNG_SWAP_ALPHA + * 21) PNG_SWAP_BYTES + * 22) PNG_USER_TRANSFORM [must be last] + */ +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED + if ((png_ptr->transformations & PNG_STRIP_ALPHA) && + !(png_ptr->transformations & PNG_COMPOSE)) + { + /* Stripping the alpha channel happens immediately after the 'expand' + * transformations, before all other transformation, so it cancels out + * the alpha handling. It has the side effect negating the effect of + * PNG_EXPAND_tRNS too: + */ + png_ptr->transformations &= ~(PNG_BACKGROUND_EXPAND | PNG_ENCODE_ALPHA | + PNG_EXPAND_tRNS); + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; + + /* Kill the tRNS chunk itself too. Prior to 1.5.3 this did not happen + * so transparency information would remain just so long as it wasn't + * expanded. This produces unexpected API changes if the set of things + * that do PNG_EXPAND_tRNS changes (perfectly possible given the + * documentation - which says ask for what you want, accept what you + * get.) This makes the behavior consistent from 1.5.3: + */ + png_ptr->num_trans = 0; } +#endif /* STRIP_ALPHA supported, no COMPOSE */ + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED + /* If the screen gamma is about 1.0 then the OPTIMIZE_ALPHA and ENCODE_ALPHA + * settings will have no effect. + */ + if (!png_gamma_significant(png_ptr->screen_gamma)) + { + png_ptr->transformations &= ~PNG_ENCODE_ALPHA; + png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; } #endif -#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) - png_ptr->background_1 = png_ptr->background; -#endif -#ifdef PNG_READ_GAMMA_SUPPORTED +#if defined(PNG_READ_EXPAND_SUPPORTED) && \ + defined(PNG_READ_BACKGROUND_SUPPORTED) && \ + defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) + /* Detect gray background and attempt to enable optimization for + * gray --> RGB case. + * + * Note: if PNG_BACKGROUND_EXPAND is set and color_type is either RGB or + * RGB_ALPHA (in which case need_expand is superfluous anyway), the + * background color might actually be gray yet not be flagged as such. + * This is not a problem for the current code, which uses + * PNG_BACKGROUND_IS_GRAY only to decide when to do the + * png_do_gray_to_rgb() transformation. + * + * NOTE: this code needs to be revised to avoid the complexity and + * interdependencies. The color type of the background should be recorded in + * png_set_background, along with the bit depth, then the code has a record + * of exactly what color space the background is currently in. + */ + if (png_ptr->transformations & PNG_BACKGROUND_EXPAND) + { + /* PNG_BACKGROUND_EXPAND: the background is in the file color space, so if + * the file was greyscale the background value is gray. + */ + if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) + png_ptr->mode |= PNG_BACKGROUND_IS_GRAY; + } - if ((color_type == PNG_COLOR_TYPE_PALETTE && png_ptr->num_trans != 0) - && png_gamma_threshold(png_ptr->screen_gamma, png_ptr->gamma)) + else if (png_ptr->transformations & PNG_COMPOSE) { - int i, k; - k=0; - for (i=0; inum_trans; i++) + /* PNG_COMPOSE: png_set_background was called with need_expand false, + * so the color is in the color space of the output or png_set_alpha_mode + * was called and the color is black. Ignore RGB_TO_GRAY because that + * happens before GRAY_TO_RGB. + */ + if (png_ptr->transformations & PNG_GRAY_TO_RGB) { - if (png_ptr->trans_alpha[i] != 0 && png_ptr->trans_alpha[i] != 0xff) - k=1; /* Partial transparency is present */ + if (png_ptr->background.red == png_ptr->background.green && + png_ptr->background.red == png_ptr->background.blue) + { + png_ptr->mode |= PNG_BACKGROUND_IS_GRAY; + png_ptr->background.gray = png_ptr->background.red; + } } - if (k == 0) - png_ptr->transformations &= ~PNG_GAMMA; } +#endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED (etc) */ + + /* For indexed PNG data (PNG_COLOR_TYPE_PALETTE) many of the transformations + * can be performed directly on the palette, and some (such as rgb to gray) + * can be optimized inside the palette. This is particularly true of the + * composite (background and alpha) stuff, which can be pretty much all done + * in the palette even if the result is expanded to RGB or gray afterward. + * + * NOTE: this is Not Yet Implemented, the code behaves as in 1.5.1 and + * earlier and the palette stuff is actually handled on the first row. This + * leads to the reported bug that the palette returned by png_get_PLTE is not + * updated. + */ + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + png_init_palette_transformations(png_ptr); + + else + png_init_rgb_transformations(png_ptr); + + /* NOTE: below 'PNG_READ_ALPHA_MODE_SUPPORTED' is presumed to also enable the + * background support (see the comments in scripts/pnglibconf.dfa), this + * allows pre-multiplication of the alpha channel to be implemented as + * compositing on black. This is probably sub-optimal and has been done in + * 1.5.3 betas simply to enable external critique and testing (i.e. to + * implement the new API quickly, without lots of internal changes.) + */ - if ((png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY)) && - png_ptr->gamma != 0) +#ifdef PNG_READ_GAMMA_SUPPORTED +# ifdef PNG_READ_BACKGROUND_SUPPORTED + /* Includes ALPHA_MODE */ + png_ptr->background_1 = png_ptr->background; +# endif + + /* This needs to change - in the palette image case a whole set of tables are + * built when it would be quicker to just calculate the correct value for + * each palette entry directly. Also, the test is too tricky - why check + * PNG_RGB_TO_GRAY if PNG_GAMMA is not set? The answer seems to be that + * PNG_GAMMA is cancelled even if the gamma is known? The test excludes the + * PNG_COMPOSE case, so apparently if there is no *overall* gamma correction + * the gamma tables will not be built even if composition is required on a + * gamma encoded value. + * + * In 1.5.3 this is addressed below by an additional check on the individual + * file gamma - if it is not 1.0 both RGB_TO_GRAY and COMPOSE need the + * tables. + */ + if ((png_ptr->transformations & PNG_GAMMA) + || ((png_ptr->transformations & PNG_RGB_TO_GRAY) + && (png_gamma_significant(png_ptr->gamma) || + png_gamma_significant(png_ptr->screen_gamma))) + || ((png_ptr->transformations & PNG_COMPOSE) + && (png_gamma_significant(png_ptr->gamma) + || png_gamma_significant(png_ptr->screen_gamma) + || (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_UNIQUE + && png_gamma_significant(png_ptr->background_gamma)))) + || ((png_ptr->transformations & PNG_ENCODE_ALPHA) + && png_gamma_significant(png_ptr->screen_gamma)) + ) { png_build_gamma_table(png_ptr, png_ptr->bit_depth); #ifdef PNG_READ_BACKGROUND_SUPPORTED - if (png_ptr->transformations & PNG_BACKGROUND) + if (png_ptr->transformations & PNG_COMPOSE) { - if (color_type == PNG_COLOR_TYPE_PALETTE) + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { - /* Could skip if no transparency */ + /* We don't get to here unless there is a tRNS chunk with non-opaque + * entries - see the checking code at the start of this function. + */ png_color back, back_1; png_colorp palette = png_ptr->palette; int num_palette = png_ptr->num_palette; int i; @@ -1032,28 +1470,41 @@ } if (png_gamma_significant(gs)) { - back.red = (png_byte)png_ptr->background.red; - back.green = (png_byte)png_ptr->background.green; - back.blue = (png_byte)png_ptr->background.blue; - } - - else - { back.red = png_gamma_8bit_correct(png_ptr->background.red, gs); back.green = png_gamma_8bit_correct(png_ptr->background.green, gs); back.blue = png_gamma_8bit_correct(png_ptr->background.blue, gs); } - back_1.red = png_gamma_8bit_correct(png_ptr->background.red, g); - back_1.green = png_gamma_8bit_correct(png_ptr->background.green, + + else + { + back.red = (png_byte)png_ptr->background.red; + back.green = (png_byte)png_ptr->background.green; + back.blue = (png_byte)png_ptr->background.blue; + } + + if (png_gamma_significant(g)) + { + back_1.red = png_gamma_8bit_correct(png_ptr->background.red, g); + back_1.green = png_gamma_8bit_correct( + png_ptr->background.green, g); back_1.blue = png_gamma_8bit_correct(png_ptr->background.blue, g); } + + else + { + back_1.red = (png_byte)png_ptr->background.red; + back_1.green = (png_byte)png_ptr->background.green; + back_1.blue = (png_byte)png_ptr->background.blue; + } + } + for (i = 0; i < num_palette; i++) { if (i < (int)png_ptr->num_trans && png_ptr->trans_alpha[i] != 0xff) @@ -1085,21 +1536,20 @@ palette[i].green = png_ptr->gamma_table[palette[i].green]; palette[i].blue = png_ptr->gamma_table[palette[i].blue]; } } - /* Prevent the transformations being done again, and make sure - * that the now spurious alpha channel is stripped - the code - * has just reduced background composition and gamma correction - * to a simple alpha channel strip. + + /* Prevent the transformations being done again. + * + * NOTE: this is highly dubious; it zaps the transformations in + * place. This seems inconsistent with the general treatment of the + * transformations elsewhere. */ - png_ptr->transformations &= ~PNG_BACKGROUND; - png_ptr->transformations &= ~PNG_GAMMA; - png_ptr->transformations |= PNG_STRIP_ALPHA; - } + png_ptr->transformations &= ~(PNG_COMPOSE | PNG_GAMMA); + } /* color_type == PNG_COLOR_TYPE_PALETTE */ /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */ - else - /* color_type != PNG_COLOR_TYPE_PALETTE */ + else /* color_type != PNG_COLOR_TYPE_PALETTE */ { png_fixed_point g = PNG_FP_1; png_fixed_point gs = PNG_FP_1; @@ -1163,19 +1613,23 @@ png_ptr->background.red = png_ptr->background.green = png_ptr->background.blue = png_ptr->background.gray; } - } - } + } /* color_type != PNG_COLOR_TYPE_PALETTE */ + }/* png_ptr->transformations & PNG_BACKGROUND */ + else /* Transformation does not include PNG_BACKGROUND */ #endif /* PNG_READ_BACKGROUND_SUPPORTED */ - if (color_type == PNG_COLOR_TYPE_PALETTE) + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { png_colorp palette = png_ptr->palette; int num_palette = png_ptr->num_palette; int i; + /*NOTE: there are other transformations that should probably be in here + * too. + */ for (i = 0; i < num_palette; i++) { palette[i].red = png_ptr->gamma_table[palette[i].red]; palette[i].green = png_ptr->gamma_table[palette[i].green]; @@ -1183,9 +1637,9 @@ } /* Done the gamma correction. */ png_ptr->transformations &= ~PNG_GAMMA; - } + } /* color_type == PALETTE && !PNG_BACKGROUND transformation */ } #ifdef PNG_READ_BACKGROUND_SUPPORTED else #endif @@ -1189,12 +1643,13 @@ #ifdef PNG_READ_BACKGROUND_SUPPORTED else #endif #endif /* PNG_READ_GAMMA_SUPPORTED */ + #ifdef PNG_READ_BACKGROUND_SUPPORTED - /* No GAMMA transformation */ - if ((png_ptr->transformations & PNG_BACKGROUND) && - (color_type == PNG_COLOR_TYPE_PALETTE)) + /* No GAMMA transformation (see the hanging else 4 lines above) */ + if ((png_ptr->transformations & PNG_COMPOSE) && + (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)) { int i; int istop = (int)png_ptr->num_trans; png_color back; @@ -1224,17 +1679,15 @@ png_ptr->trans_alpha[i], back.blue); } } - /* Handled alpha, still need to strip the channel. */ - png_ptr->transformations &= ~PNG_BACKGROUND; - png_ptr->transformations |= PNG_STRIP_ALPHA; + png_ptr->transformations &= ~PNG_COMPOSE; } #endif /* PNG_READ_BACKGROUND_SUPPORTED */ #ifdef PNG_READ_SHIFT_SUPPORTED if ((png_ptr->transformations & PNG_SHIFT) && - (color_type == PNG_COLOR_TYPE_PALETTE)) + (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)) { png_uint_16 i; png_uint_16 istop = png_ptr->num_palette; int sr = 8 - png_ptr->sig_bit.red; @@ -1258,14 +1711,8 @@ } } #endif /* PNG_READ_SHIFT_SUPPORTED */ } -#if !defined(PNG_READ_GAMMA_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) \ - && !defined(PNG_READ_BACKGROUND_SUPPORTED) - if (png_ptr) - return; -#endif -} /* Modify the info structure to reflect the transformations. The * info should be updated so a PNG file could be written with it, * assuming the transformations result in valid PNG data. @@ -1312,23 +1759,24 @@ info_ptr->bit_depth = 16; } #endif -#ifdef PNG_READ_BACKGROUND_SUPPORTED - if (png_ptr->transformations & PNG_BACKGROUND) - { - info_ptr->color_type = (png_byte)(info_ptr->color_type & - ~PNG_COLOR_MASK_ALPHA); - info_ptr->num_trans = 0; +#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) + /* The following is almost certainly wrong unless the background value is in + * the screen space! + */ + if (png_ptr->transformations & PNG_COMPOSE) info_ptr->background = png_ptr->background; - } #endif #ifdef PNG_READ_GAMMA_SUPPORTED - if (png_ptr->transformations & PNG_GAMMA) - { + /* The following used to be conditional on PNG_GAMMA (prior to 1.5.3), + * however it seems that the code in png_init_read_transformations, which has + * been called before this from png_read_update_info->png_read_start_row + * sometimes does the gamma transform and cancels the flag. + */ info_ptr->gamma = png_ptr->gamma; - } #endif #ifdef PNG_READ_16_TO_8_SUPPORTED #ifdef PNG_READ_16BIT_SUPPORTED @@ -1381,9 +1829,12 @@ info_ptr->channels = 1; #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED if (png_ptr->transformations & PNG_STRIP_ALPHA) + { info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA; + info_ptr->num_trans = 0; + } #endif if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) info_ptr->channels++; @@ -1434,31 +1885,29 @@ png_debug(1, "in png_do_read_transformations"); if (png_ptr->row_buf == NULL) { -#ifdef PNG_CONSOLE_IO_SUPPORTED - char msg[50]; - - png_snprintf2(msg, 50, - "NULL row buffer for row %ld, pass %d", (long)png_ptr->row_number, - png_ptr->pass); - png_error(png_ptr, msg); -#else + /* Prior to 1.5.3 this output row/pass where the NULL pointer is, but this + * error is incredibly rare and incredibly easy to debug without this + * information. + */ png_error(png_ptr, "NULL row buffer"); -#endif } -#ifdef PNG_WARN_UNINITIALIZED_ROW - if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) - /* Application has failed to call either png_read_start_image() - * or png_read_update_info() after setting transforms that expand - * pixels. This check added to libpng-1.2.19 + + /* The following is debugging; prior to 1.5.3 the code was never compiled in; + * in 1.5.3 PNG_FLAG_DETECT_UNINITIALIZED was added and the macro + * PNG_WARN_UNINITIALIZED_ROW removed. In 1.5 the new flag is set only for + * selected new APIs to ensure that there is no API change. + */ + if ((png_ptr->flags & PNG_FLAG_DETECT_UNINITIALIZED) != 0 && + !(png_ptr->flags & PNG_FLAG_ROW_INIT)) + { + /* Application has failed to call either png_read_start_image() or + * png_read_update_info() after setting transforms that expand pixels. + * This check added to libpng-1.2.19 (but not enabled until 1.5.3). */ -#if (PNG_WARN_UNINITIALIZED_ROW==1) png_error(png_ptr, "Uninitialized row"); -#else - png_warning(png_ptr, "Uninitialized row"); -#endif -#endif + } #ifdef PNG_READ_EXPAND_SUPPORTED if (png_ptr->transformations & PNG_EXPAND) { @@ -1481,18 +1930,28 @@ } } #endif - /* Delay the 'expand 16' step until later for efficiency, so that the + /* TODO: Delay the 'expand 16' step until later for efficiency, so that the * intermediate steps work with 8 bit data. */ +#ifdef PNG_READ_EXPAND_16_SUPPORTED + /* Do the expansion now, after all the arithmetic has been done. Notice + * that previous transformations can handle the PNG_EXPAND_16 flag if this + * is efficient (particularly true in the case of gamma correction, where + * better accuracy results faster!) + */ + if (png_ptr->transformations & PNG_EXPAND_16) + png_do_expand_16(&png_ptr->row_info, png_ptr->row_buf + 1); +#endif #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED if ((png_ptr->transformations & PNG_STRIP_ALPHA) && + !(png_ptr->transformations & PNG_COMPOSE) && (png_ptr->row_info.color_type == PNG_COLOR_TYPE_RGB_ALPHA || png_ptr->row_info.color_type == PNG_COLOR_TYPE_GRAY_ALPHA)) png_do_strip_channel(&(png_ptr->row_info), png_ptr->row_buf + 1, - 0/*!at_start, because SWAP_ALPHA happens later*/); + 0 /* at_start == false, because SWAP_ALPHA happens later */); #endif #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED if (png_ptr->transformations & PNG_RGB_TO_GRAY) @@ -1554,35 +2013,39 @@ !(png_ptr->mode & PNG_BACKGROUND_IS_GRAY)) png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#ifdef PNG_READ_BACKGROUND_SUPPORTED - if ((png_ptr->transformations & PNG_BACKGROUND) && - ((png_ptr->num_trans != 0) || - (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) - png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1, - &(png_ptr->trans_color), &(png_ptr->background) -#ifdef PNG_READ_GAMMA_SUPPORTED - , &(png_ptr->background_1), - png_ptr->gamma_table, png_ptr->gamma_from_1, - png_ptr->gamma_to_1, png_ptr->gamma_16_table, - png_ptr->gamma_16_from_1, png_ptr->gamma_16_to_1, - png_ptr->gamma_shift -#endif - ); +#if (defined PNG_READ_BACKGROUND_SUPPORTED) ||\ + (defined PNG_READ_ALPHA_MODE_SUPPORTED) + if (png_ptr->transformations & PNG_COMPOSE) + png_do_compose(&(png_ptr->row_info), png_ptr->row_buf + 1, png_ptr); #endif #ifdef PNG_READ_GAMMA_SUPPORTED if ((png_ptr->transformations & PNG_GAMMA) && -#ifdef PNG_READ_BACKGROUND_SUPPORTED - !((png_ptr->transformations & PNG_BACKGROUND) && +#if (defined PNG_READ_BACKGROUND_SUPPORTED) ||\ + (defined PNG_READ_ALPHA_MODE_SUPPORTED) + !((png_ptr->transformations & PNG_COMPOSE) && ((png_ptr->num_trans != 0) || (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) && #endif (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)) - png_do_gamma(&(png_ptr->row_info), png_ptr->row_buf + 1, - png_ptr->gamma_table, png_ptr->gamma_16_table, - png_ptr->gamma_shift); + png_do_gamma(&(png_ptr->row_info), png_ptr->row_buf + 1, png_ptr); +#endif + +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED + if ((png_ptr->transformations & PNG_STRIP_ALPHA) && + (png_ptr->transformations & PNG_COMPOSE) && + (png_ptr->row_info.color_type == PNG_COLOR_TYPE_RGB_ALPHA || + png_ptr->row_info.color_type == PNG_COLOR_TYPE_GRAY_ALPHA)) + png_do_strip_channel(&(png_ptr->row_info), png_ptr->row_buf + 1, + 0 /* at_start == false, because SWAP_ALPHA happens later */); +#endif + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED + if ((png_ptr->transformations & PNG_ENCODE_ALPHA) && + (png_ptr->row_info.color_type & PNG_COLOR_MASK_ALPHA)) + png_do_encode_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1, png_ptr); #endif #ifdef PNG_READ_16_TO_8_SUPPORTED if (png_ptr->transformations & PNG_16_TO_8) @@ -1599,8 +2062,13 @@ png_error(png_ptr, "png_do_quantize returned rowbytes=0"); } #endif /* PNG_READ_QUANTIZE_SUPPORTED */ +#if 0 + /* This is where this code *should* be for efficiency, but that requires all + * the inaccurate calculations above to output 16 bit values if expand_16 is + * set! + */ #ifdef PNG_READ_EXPAND_16_SUPPORTED /* Do the expansion now, after all the arithmetic has been done. Notice * that previous transformations can handle the PNG_EXPAND_16 flag if this * is efficient (particularly true in the case of gamma correction, where @@ -1608,8 +2076,16 @@ */ if (png_ptr->transformations & PNG_EXPAND_16) png_do_expand_16(&png_ptr->row_info, png_ptr->row_buf + 1); #endif +#endif /*commented out*/ + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED + /*NOTE: moved here in 1.5.3 (from much later in this list.) */ + if ((png_ptr->transformations & PNG_GRAY_TO_RGB) && + (png_ptr->mode & PNG_BACKGROUND_IS_GRAY)) + png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif #ifdef PNG_READ_INVERT_SUPPORTED if (png_ptr->transformations & PNG_INVERT_MONO) png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1); @@ -1635,18 +2111,8 @@ if (png_ptr->transformations & PNG_PACKSWAP) png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED - /*NOTE: this must be in the wrong place - what happens if BGR is set too? - * Need pngvalid to test this combo. - */ - /* If gray -> RGB, do so now only if we did not do so above */ - if ((png_ptr->transformations & PNG_GRAY_TO_RGB) && - (png_ptr->mode & PNG_BACKGROUND_IS_GRAY)) - png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1); -#endif - #ifdef PNG_READ_FILLER_SUPPORTED if (png_ptr->transformations & PNG_FILLER) png_do_read_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, (png_uint_32)png_ptr->filler, png_ptr->flags); @@ -2720,13 +3185,15 @@ } return rgb_error; } #endif +#endif /* PNG_READ_TRANSFORMS_SUPPORTED */ +#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED /* Build a grayscale palette. Palette is assumed to be 1 << bit_depth * large of png_color. This lets grayscale images be treated as * paletted. Most useful for gamma correction and simplification - * of code. + * of code. This API is not used internally. */ void PNGAPI png_build_grayscale_palette(int bit_depth, png_colorp palette) { @@ -2774,36 +3241,38 @@ palette[i].green = (png_byte)v; palette[i].blue = (png_byte)v; } } +#endif +#ifdef PNG_READ_TRANSFORMS_SUPPORTED #ifdef PNG_READ_BACKGROUND_SUPPORTED /* Replace any alpha or transparency with the supplied background color. * "background" is already in the screen gamma, while "background_1" is * at a gamma of 1.0. Paletted files have already been taken care of. */ void /* PRIVATE */ -png_do_background(png_row_infop row_info, png_bytep row, - png_const_color_16p trans_color, png_const_color_16p background +png_do_compose(png_row_infop row_info, png_bytep row, png_structp png_ptr) +{ #ifdef PNG_READ_GAMMA_SUPPORTED - , png_const_color_16p background_1, png_const_bytep gamma_table, - png_const_bytep gamma_from_1, png_const_bytep gamma_to_1, - png_const_uint_16pp gamma_16, png_const_uint_16pp gamma_16_from_1, - png_const_uint_16pp gamma_16_to_1, int gamma_shift + png_const_bytep gamma_table = png_ptr->gamma_table; + png_const_bytep gamma_from_1 = png_ptr->gamma_from_1; + png_const_bytep gamma_to_1 = png_ptr->gamma_to_1; + png_const_uint_16pp gamma_16 = png_ptr->gamma_16_table; + png_const_uint_16pp gamma_16_from_1 = png_ptr->gamma_16_from_1; + png_const_uint_16pp gamma_16_to_1 = png_ptr->gamma_16_to_1; + int gamma_shift = png_ptr->gamma_shift; #endif - ) -{ - png_bytep sp, dp; + + png_bytep sp; png_uint_32 i; png_uint_32 row_width = row_info->width; + int optimize = (png_ptr->flags & PNG_FLAG_OPTIMIZE_ALPHA) != 0; int shift; - png_debug(1, "in png_do_background"); + png_debug(1, "in png_do_compose"); - if (background != NULL && - (!(row_info->color_type & PNG_COLOR_MASK_ALPHA) || - (row_info->color_type != PNG_COLOR_TYPE_PALETTE && trans_color))) { switch (row_info->color_type) { case PNG_COLOR_TYPE_GRAY: @@ -2816,12 +3285,12 @@ shift = 7; for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x01) - == trans_color->gray) + == png_ptr->trans_color.gray) { *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff); - *sp |= (png_byte)(background->gray << shift); + *sp |= (png_byte)(png_ptr->background.gray << shift); } if (!shift) { @@ -2844,12 +3313,12 @@ shift = 6; for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x03) - == trans_color->gray) + == png_ptr->trans_color.gray) { *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); - *sp |= (png_byte)(background->gray << shift); + *sp |= (png_byte)(png_ptr->background.gray << shift); } else { @@ -2878,12 +3347,12 @@ shift = 6; for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x03) - == trans_color->gray) + == png_ptr->trans_color.gray) { *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); - *sp |= (png_byte)(background->gray << shift); + *sp |= (png_byte)(png_ptr->background.gray << shift); } if (!shift) { @@ -2907,12 +3376,12 @@ shift = 4; for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x0f) - == trans_color->gray) + == png_ptr->trans_color.gray) { *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); - *sp |= (png_byte)(background->gray << shift); + *sp |= (png_byte)(png_ptr->background.gray << shift); } else { @@ -2941,12 +3410,12 @@ shift = 4; for (i = 0; i < row_width; i++) { if ((png_uint_16)((*sp >> shift) & 0x0f) - == trans_color->gray) + == png_ptr->trans_color.gray) { *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); - *sp |= (png_byte)(background->gray << shift); + *sp |= (png_byte)(png_ptr->background.gray << shift); } if (!shift) { @@ -2968,10 +3437,10 @@ { sp = row; for (i = 0; i < row_width; i++, sp++) { - if (*sp == trans_color->gray) - *sp = (png_byte)background->gray; + if (*sp == png_ptr->trans_color.gray) + *sp = (png_byte)png_ptr->background.gray; else *sp = gamma_table[*sp]; } @@ -2981,10 +3450,10 @@ { sp = row; for (i = 0; i < row_width; i++, sp++) { - if (*sp == trans_color->gray) - *sp = (png_byte)background->gray; + if (*sp == png_ptr->trans_color.gray) + *sp = (png_byte)png_ptr->background.gray; } } break; } @@ -3000,13 +3469,13 @@ png_uint_16 v; v = (png_uint_16)(((*sp) << 8) + *(sp + 1)); - if (v == trans_color->gray) + if (v == png_ptr->trans_color.gray) { /* Background is already in screen gamma */ - *sp = (png_byte)((background->gray >> 8) & 0xff); - *(sp + 1) = (png_byte)(background->gray & 0xff); + *sp = (png_byte)((png_ptr->background.gray >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff); } else { @@ -3025,12 +3494,12 @@ png_uint_16 v; v = (png_uint_16)(((*sp) << 8) + *(sp + 1)); - if (v == trans_color->gray) + if (v == png_ptr->trans_color.gray) { - *sp = (png_byte)((background->gray >> 8) & 0xff); - *(sp + 1) = (png_byte)(background->gray & 0xff); + *sp = (png_byte)((png_ptr->background.gray >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff); } } } break; @@ -3051,15 +3520,15 @@ { sp = row; for (i = 0; i < row_width; i++, sp += 3) { - if (*sp == trans_color->red && - *(sp + 1) == trans_color->green && - *(sp + 2) == trans_color->blue) - { - *sp = (png_byte)background->red; - *(sp + 1) = (png_byte)background->green; - *(sp + 2) = (png_byte)background->blue; + if (*sp == png_ptr->trans_color.red && + *(sp + 1) == png_ptr->trans_color.green && + *(sp + 2) == png_ptr->trans_color.blue) + { + *sp = (png_byte)png_ptr->background.red; + *(sp + 1) = (png_byte)png_ptr->background.green; + *(sp + 2) = (png_byte)png_ptr->background.blue; } else { @@ -3074,15 +3543,15 @@ { sp = row; for (i = 0; i < row_width; i++, sp += 3) { - if (*sp == trans_color->red && - *(sp + 1) == trans_color->green && - *(sp + 2) == trans_color->blue) - { - *sp = (png_byte)background->red; - *(sp + 1) = (png_byte)background->green; - *(sp + 2) = (png_byte)background->blue; + if (*sp == png_ptr->trans_color.red && + *(sp + 1) == png_ptr->trans_color.green && + *(sp + 2) == png_ptr->trans_color.blue) + { + *sp = (png_byte)png_ptr->background.red; + *(sp + 1) = (png_byte)png_ptr->background.green; + *(sp + 2) = (png_byte)png_ptr->background.blue; } } } } @@ -3101,18 +3570,19 @@ png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8) + *(sp + 5)); - if (r == trans_color->red && g == trans_color->green && - b == trans_color->blue) + if (r == png_ptr->trans_color.red && + g == png_ptr->trans_color.green && + b == png_ptr->trans_color.blue) { /* Background is already in screen gamma */ - *sp = (png_byte)((background->red >> 8) & 0xff); - *(sp + 1) = (png_byte)(background->red & 0xff); - *(sp + 2) = (png_byte)((background->green >> 8) & 0xff); - *(sp + 3) = (png_byte)(background->green & 0xff); - *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff); - *(sp + 5) = (png_byte)(background->blue & 0xff); + *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff); + *(sp + 2) = (png_byte)((png_ptr->background.green >> 8) & 0xff); + *(sp + 3) = (png_byte)(png_ptr->background.green & 0xff); + *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8) & 0xff); + *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff); } else { @@ -3144,17 +3614,18 @@ png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8) + *(sp + 5)); - if (r == trans_color->red && g == trans_color->green && - b == trans_color->blue) - { - *sp = (png_byte)((background->red >> 8) & 0xff); - *(sp + 1) = (png_byte)(background->red & 0xff); - *(sp + 2) = (png_byte)((background->green >> 8) & 0xff); - *(sp + 3) = (png_byte)(background->green & 0xff); - *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff); - *(sp + 5) = (png_byte)(background->blue & 0xff); + if (r == png_ptr->trans_color.red && + g == png_ptr->trans_color.green && + b == png_ptr->trans_color.blue) + { + *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff); + *(sp + 2) = (png_byte)((png_ptr->background.green >> 8) & 0xff); + *(sp + 3) = (png_byte)(png_ptr->background.green & 0xff); + *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8) & 0xff); + *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff); } } } } @@ -3169,54 +3640,46 @@ if (gamma_to_1 != NULL && gamma_from_1 != NULL && gamma_table != NULL) { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 2, dp++) + for (i = 0; i < row_width; i++, sp += 2) { png_uint_16 a = *(sp + 1); if (a == 0xff) - *dp = gamma_table[*sp]; + *sp = gamma_table[*sp]; else if (a == 0) { /* Background is already in screen gamma */ - *dp = (png_byte)background->gray; + *sp = (png_byte)png_ptr->background.gray; } else { png_byte v, w; v = gamma_to_1[*sp]; - png_composite(w, v, a, background_1->gray); - *dp = gamma_from_1[w]; + png_composite(w, v, a, png_ptr->background_1.gray); + if (!optimize) + w = gamma_from_1[w]; + *sp = w; } } } else #endif { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 2, dp++) + for (i = 0; i < row_width; i++, sp += 2) { png_byte a = *(sp + 1); - if (a == 0xff) - *dp = *sp; - -#ifdef PNG_READ_GAMMA_SUPPORTED - else if (a == 0) - *dp = (png_byte)background->gray; + if (a == 0) + *sp = (png_byte)png_ptr->background.gray; - else - png_composite(*dp, *sp, a, background_1->gray); - -#else - *dp = (png_byte)background->gray; -#endif + else if (a < 0xff) + png_composite(*sp, *sp, a, png_ptr->background_1.gray); } } } else /* if (png_ptr->bit_depth == 16) */ @@ -3225,10 +3688,9 @@ if (gamma_16 != NULL && gamma_16_from_1 != NULL && gamma_16_to_1 != NULL) { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 4, dp += 2) + for (i = 0; i < row_width; i++, sp += 4) { png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8) + *(sp + 3)); @@ -3236,71 +3698,58 @@ { png_uint_16 v; v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; - *dp = (png_byte)((v >> 8) & 0xff); - *(dp + 1) = (png_byte)(v & 0xff); + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); } -#ifdef PNG_READ_GAMMA_SUPPORTED else if (a == 0) -#else - else -#endif { /* Background is already in screen gamma */ - *dp = (png_byte)((background->gray >> 8) & 0xff); - *(dp + 1) = (png_byte)(background->gray & 0xff); + *sp = (png_byte)((png_ptr->background.gray >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff); } -#ifdef PNG_READ_GAMMA_SUPPORTED else { png_uint_16 g, v, w; g = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp]; - png_composite_16(v, g, a, background_1->gray); + png_composite_16(v, g, a, png_ptr->background_1.gray); + if (optimize) + w = v; + else w = gamma_16_from_1[(v&0xff) >> gamma_shift][v >> 8]; - *dp = (png_byte)((w >> 8) & 0xff); - *(dp + 1) = (png_byte)(w & 0xff); + *sp = (png_byte)((w >> 8) & 0xff); + *(sp + 1) = (png_byte)(w & 0xff); } -#endif } } else #endif { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 4, dp += 2) + for (i = 0; i < row_width; i++, sp += 4) { png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8) + *(sp + 3)); - if (a == (png_uint_16)0xffff) - png_memcpy(dp, sp, 2); - -#ifdef PNG_READ_GAMMA_SUPPORTED - else if (a == 0) -#else - else -#endif + if (a == 0) { - *dp = (png_byte)((background->gray >> 8) & 0xff); - *(dp + 1) = (png_byte)(background->gray & 0xff); + *sp = (png_byte)((png_ptr->background.gray >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff); } -#ifdef PNG_READ_GAMMA_SUPPORTED - else + else if (a < 0xffff) { png_uint_16 g, v; g = (png_uint_16)(((*sp) << 8) + *(sp + 1)); - png_composite_16(v, g, a, background_1->gray); - *dp = (png_byte)((v >> 8) & 0xff); - *(dp + 1) = (png_byte)(v & 0xff); + png_composite_16(v, g, a, png_ptr->background_1.gray); + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); } -#endif } } } break; @@ -3314,78 +3763,72 @@ if (gamma_to_1 != NULL && gamma_from_1 != NULL && gamma_table != NULL) { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 4, dp += 3) + for (i = 0; i < row_width; i++, sp += 4) { png_byte a = *(sp + 3); if (a == 0xff) { - *dp = gamma_table[*sp]; - *(dp + 1) = gamma_table[*(sp + 1)]; - *(dp + 2) = gamma_table[*(sp + 2)]; + *sp = gamma_table[*sp]; + *(sp + 1) = gamma_table[*(sp + 1)]; + *(sp + 2) = gamma_table[*(sp + 2)]; } else if (a == 0) { /* Background is already in screen gamma */ - *dp = (png_byte)background->red; - *(dp + 1) = (png_byte)background->green; - *(dp + 2) = (png_byte)background->blue; + *sp = (png_byte)png_ptr->background.red; + *(sp + 1) = (png_byte)png_ptr->background.green; + *(sp + 2) = (png_byte)png_ptr->background.blue; } else { png_byte v, w; v = gamma_to_1[*sp]; - png_composite(w, v, a, background_1->red); - *dp = gamma_from_1[w]; + png_composite(w, v, a, png_ptr->background_1.red); + if (!optimize) w = gamma_from_1[w]; + *sp = w; v = gamma_to_1[*(sp + 1)]; - png_composite(w, v, a, background_1->green); - *(dp + 1) = gamma_from_1[w]; + png_composite(w, v, a, png_ptr->background_1.green); + if (!optimize) w = gamma_from_1[w]; + *(sp + 1) = w; v = gamma_to_1[*(sp + 2)]; - png_composite(w, v, a, background_1->blue); - *(dp + 2) = gamma_from_1[w]; + png_composite(w, v, a, png_ptr->background_1.blue); + if (!optimize) w = gamma_from_1[w]; + *(sp + 2) = w; } } } else #endif { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 4, dp += 3) + for (i = 0; i < row_width; i++, sp += 4) { png_byte a = *(sp + 3); - if (a == 0xff) + if (a == 0) { - *dp = *sp; - *(dp + 1) = *(sp + 1); - *(dp + 2) = *(sp + 2); + *sp = (png_byte)png_ptr->background.red; + *(sp + 1) = (png_byte)png_ptr->background.green; + *(sp + 2) = (png_byte)png_ptr->background.blue; } - else if (a == 0) + else if (a < 0xff) { - *dp = (png_byte)background->red; - *(dp + 1) = (png_byte)background->green; - *(dp + 2) = (png_byte)background->blue; - } + png_composite(*sp, *sp, a, png_ptr->background.red); - else - { - png_composite(*dp, *sp, a, background->red); - - png_composite(*(dp + 1), *(sp + 1), a, - background->green); + png_composite(*(sp + 1), *(sp + 1), a, + png_ptr->background.green); - png_composite(*(dp + 2), *(sp + 2), a, - background->blue); + png_composite(*(sp + 2), *(sp + 2), a, + png_ptr->background.blue); } } } } @@ -3395,10 +3838,9 @@ if (gamma_16 != NULL && gamma_16_from_1 != NULL && gamma_16_to_1 != NULL) { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 8, dp += 6) + for (i = 0; i < row_width; i++, sp += 8) { png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6)) << 8) + (png_uint_16)(*(sp + 7))); @@ -3406,85 +3848,81 @@ { png_uint_16 v; v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; - *dp = (png_byte)((v >> 8) & 0xff); - *(dp + 1) = (png_byte)(v & 0xff); + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)]; - *(dp + 2) = (png_byte)((v >> 8) & 0xff); - *(dp + 3) = (png_byte)(v & 0xff); + *(sp + 2) = (png_byte)((v >> 8) & 0xff); + *(sp + 3) = (png_byte)(v & 0xff); v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)]; - *(dp + 4) = (png_byte)((v >> 8) & 0xff); - *(dp + 5) = (png_byte)(v & 0xff); + *(sp + 4) = (png_byte)((v >> 8) & 0xff); + *(sp + 5) = (png_byte)(v & 0xff); } else if (a == 0) { /* Background is already in screen gamma */ - *dp = (png_byte)((background->red >> 8) & 0xff); - *(dp + 1) = (png_byte)(background->red & 0xff); - *(dp + 2) = (png_byte)((background->green >> 8) & 0xff); - *(dp + 3) = (png_byte)(background->green & 0xff); - *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff); - *(dp + 5) = (png_byte)(background->blue & 0xff); + *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff); + *(sp + 2) = (png_byte)((png_ptr->background.green >> 8) & 0xff); + *(sp + 3) = (png_byte)(png_ptr->background.green & 0xff); + *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8) & 0xff); + *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff); } else { - png_uint_16 v, w, x; + png_uint_16 v, w; v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp]; - png_composite_16(w, v, a, background_1->red); - - x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; - *dp = (png_byte)((x >> 8) & 0xff); - *(dp + 1) = (png_byte)(x & 0xff); + png_composite_16(w, v, a, png_ptr->background_1.red); + if (!optimize) + w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; + *sp = (png_byte)((w >> 8) & 0xff); + *(sp + 1) = (png_byte)(w & 0xff); v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)]; - png_composite_16(w, v, a, background_1->green); + png_composite_16(w, v, a, png_ptr->background_1.green); + if (!optimize) + w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; - x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; - *(dp + 2) = (png_byte)((x >> 8) & 0xff); - *(dp + 3) = (png_byte)(x & 0xff); + *(sp + 2) = (png_byte)((w >> 8) & 0xff); + *(sp + 3) = (png_byte)(w & 0xff); v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)]; - png_composite_16(w, v, a, background_1->blue); + png_composite_16(w, v, a, png_ptr->background_1.blue); + if (!optimize) + w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; - x = gamma_16_from_1[(w & 0xff) >> gamma_shift][w >> 8]; - *(dp + 4) = (png_byte)((x >> 8) & 0xff); - *(dp + 5) = (png_byte)(x & 0xff); + *(sp + 4) = (png_byte)((w >> 8) & 0xff); + *(sp + 5) = (png_byte)(w & 0xff); } } } else #endif { sp = row; - dp = row; - for (i = 0; i < row_width; i++, sp += 8, dp += 6) + for (i = 0; i < row_width; i++, sp += 8) { png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6)) << 8) + (png_uint_16)(*(sp + 7))); - if (a == (png_uint_16)0xffff) - { - png_memcpy(dp, sp, 6); - } - - else if (a == 0) + if (a == 0) { - *dp = (png_byte)((background->red >> 8) & 0xff); - *(dp + 1) = (png_byte)(background->red & 0xff); - *(dp + 2) = (png_byte)((background->green >> 8) & 0xff); - *(dp + 3) = (png_byte)(background->green & 0xff); - *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff); - *(dp + 5) = (png_byte)(background->blue & 0xff); + *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff); + *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff); + *(sp + 2) = (png_byte)((png_ptr->background.green >> 8) & 0xff); + *(sp + 3) = (png_byte)(png_ptr->background.green & 0xff); + *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8) & 0xff); + *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff); } - else + else if (a < 0xffff) { png_uint_16 v; png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1)); @@ -3492,19 +3930,19 @@ + *(sp + 3)); png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8) + *(sp + 5)); - png_composite_16(v, r, a, background->red); - *dp = (png_byte)((v >> 8) & 0xff); - *(dp + 1) = (png_byte)(v & 0xff); - - png_composite_16(v, g, a, background->green); - *(dp + 2) = (png_byte)((v >> 8) & 0xff); - *(dp + 3) = (png_byte)(v & 0xff); - - png_composite_16(v, b, a, background->blue); - *(dp + 4) = (png_byte)((v >> 8) & 0xff); - *(dp + 5) = (png_byte)(v & 0xff); + png_composite_16(v, r, a, png_ptr->background.red); + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + + png_composite_16(v, g, a, png_ptr->background.green); + *(sp + 2) = (png_byte)((v >> 8) & 0xff); + *(sp + 3) = (png_byte)(v & 0xff); + + png_composite_16(v, b, a, png_ptr->background.blue); + *(sp + 4) = (png_byte)((v >> 8) & 0xff); + *(sp + 5) = (png_byte)(v & 0xff); } } } } @@ -3513,18 +3951,8 @@ default: break; } - - if (row_info->color_type & PNG_COLOR_MASK_ALPHA) - { - row_info->color_type = (png_byte)(row_info->color_type & - ~PNG_COLOR_MASK_ALPHA); - row_info->channels--; - row_info->pixel_depth = (png_byte)(row_info->channels * - row_info->bit_depth); - row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); - } } } #endif @@ -3535,12 +3963,14 @@ * is 16, use gamma_16_table and gamma_shift. Build these with * build_gamma_table(). */ void /* PRIVATE */ -png_do_gamma(png_row_infop row_info, png_bytep row, - png_const_bytep gamma_table, png_const_uint_16pp gamma_16_table, - int gamma_shift) +png_do_gamma(png_row_infop row_info, png_bytep row, png_structp png_ptr) { + png_const_bytep gamma_table = png_ptr->gamma_table; + png_const_uint_16pp gamma_16_table = png_ptr->gamma_16_table; + int gamma_shift = png_ptr->gamma_shift; + png_bytep sp; png_uint_32 i; png_uint_32 row_width=row_info->width; @@ -3728,8 +4158,75 @@ } } #endif +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED +/* Encode the alpha channel to the output gamma (the input channel is always + * linear.) Called only with color types that have an alpha channel. Needs the + * from_1 tables. + */ +void /* PRIVATE */ +png_do_encode_alpha(png_row_infop row_info, png_bytep row, png_structp png_ptr) +{ + png_uint_32 row_width = row_info->width; + + png_debug(1, "in png_do_encode_alpha"); + + if (row_info->color_type & PNG_COLOR_MASK_ALPHA) + { + if (row_info->bit_depth == 8) + { + PNG_CONST png_bytep table = png_ptr->gamma_from_1; + + if (table != NULL) + { + PNG_CONST int step = + (row_info->color_type & PNG_COLOR_MASK_COLOR) ? 4 : 2; + + /* The alpha channel is the last component: */ + row += step - 1; + + for (; row_width > 0; --row_width, row += step) + *row = table[*row]; + + return; + } + } + + else if (row_info->bit_depth == 16) + { + PNG_CONST png_uint_16pp table = png_ptr->gamma_16_from_1; + PNG_CONST int gamma_shift = png_ptr->gamma_shift; + + if (table != NULL) + { + PNG_CONST int step = + (row_info->color_type & PNG_COLOR_MASK_COLOR) ? 8 : 4; + + /* The alpha channel is the last component: */ + row += step - 2; + + for (; row_width > 0; --row_width, row += step) + { + png_uint_16 v; + + v = table[*(row + 1) >> gamma_shift][*row]; + *row = (png_byte)((v >> 8) & 0xff); + *(row + 1) = (png_byte)(v & 0xff); + } + + return; + } + } + } + + /* Only get to here if called with a weird row_info; no harm has been done, + * so just issue a warning. + */ + png_warning(png_ptr, "png_do_encode_alpha: unexpected call"); +} +#endif + #ifdef PNG_READ_EXPAND_SUPPORTED /* Expands a palette row to an RGB or RGBA row depending * upon whether you supply trans and num_trans. */ @@ -4235,8 +4732,9 @@ } } } #endif /* PNG_READ_QUANTIZE_SUPPORTED */ +#endif /* PNG_READ_TRANSFORMS_SUPPORTED */ #ifdef PNG_MNG_FEATURES_SUPPORTED /* Undoes intrapixel differencing */ void /* PRIVATE */ diff -ru4NwbB libpng-1.5.2/pngrutil.c libpng-1.5.3beta06/pngrutil.c --- libpng-1.5.2/pngrutil.c 2011-03-31 11:23:40.773411012 -0500 +++ libpng-1.5.3beta06/pngrutil.c 2011-05-07 21:41:06.968378832 -0500 @@ -1,8 +1,8 @@ /* pngrutil.c - utilities to read a PNG file * - * Last changed in libpng 1.5.2 [March 31, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -277,10 +277,9 @@ else return (0); } -#if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \ - defined(PNG_READ_iCCP_SUPPORTED) +#ifdef PNG_READ_COMPRESSED_TEXT_SUPPORTED static png_size_t png_inflate(png_structp png_ptr, png_bytep data, png_size_t size, png_bytep output, png_size_t output_size) { @@ -369,43 +368,33 @@ /* Now handle the error codes - the API always returns 0 * and the error message is dumped into the uncompressed * buffer if available. */ +# ifdef PNG_WARNINGS_SUPPORTED { - PNG_CONST char *msg; -#ifdef PNG_CONSOLE_IO_SUPPORTED - char umsg[52]; -#endif + png_const_charp msg; + if (png_ptr->zstream.msg != 0) msg = png_ptr->zstream.msg; - else - { -#ifdef PNG_CONSOLE_IO_SUPPORTED - switch (ret) + else switch (ret) { case Z_BUF_ERROR: - msg = "Buffer error in compressed datastream in %s chunk"; + msg = "Buffer error in compressed datastream"; break; case Z_DATA_ERROR: - msg = "Data error in compressed datastream in %s chunk"; + msg = "Data error in compressed datastream"; break; default: - msg = "Incomplete compressed datastream in %s chunk"; + msg = "Incomplete compressed datastream"; break; } - png_snprintf(umsg, sizeof umsg, msg, png_ptr->chunk_name); - msg = umsg; -#else - msg = "Damaged compressed datastream in chunk other than IDAT"; -#endif - } - - png_warning(png_ptr, msg); + png_chunk_warning(png_ptr, msg); } +# endif /* 0 means an error - notice that this code simply ignores * zero length compressed chunks as a result. */ @@ -499,17 +488,11 @@ } else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */ { -#ifdef PNG_STDIO_SUPPORTED - char umsg[50]; - - png_snprintf(umsg, sizeof umsg, - "Unknown zTXt compression type %d", comp_type); - png_warning(png_ptr, umsg); -#else - png_warning(png_ptr, "Unknown zTXt compression type"); -#endif + PNG_WARNING_PARAMETERS(p) + png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_d, comp_type); + png_formatted_warning(png_ptr, p, "Unknown zTXt compression type @1"); /* The recovery is to simply drop the data. */ } @@ -535,9 +518,9 @@ } *newlength = prefix_size; } -#endif +#endif /* PNG_READ_COMPRESSED_TEXT_SUPPORTED */ /* Read and check the IDHR chunk */ void /* PRIVATE */ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) @@ -845,14 +828,12 @@ if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)) { if (PNG_OUT_OF_RANGE(igamma, 45500L, 500)) { - png_warning(png_ptr, - "Ignoring incorrect gAMA value when sRGB is also present"); - -# ifdef PNG_CONSOLE_IO_SUPPORTED - fprintf(stderr, "gamma = (%d/100000)", (int)igamma); -# endif + PNG_WARNING_PARAMETERS(p) + png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_fixed, igamma); + png_formatted_warning(png_ptr, p, + "Ignoring incorrect gAMA value @1 when sRGB is also present"); return; } } # endif /* PNG_READ_sRGB_SUPPORTED */ @@ -1019,18 +1000,22 @@ PNG_OUT_OF_RANGE(y_green, 60000L, 1000) || PNG_OUT_OF_RANGE(x_blue, 15000, 1000) || PNG_OUT_OF_RANGE(y_blue, 6000, 1000)) { - png_warning(png_ptr, - "Ignoring incorrect cHRM value when sRGB is also present"); + PNG_WARNING_PARAMETERS(p) -#ifdef PNG_CONSOLE_IO_SUPPORTED - fprintf(stderr, "wx=%d, wy=%d, rx=%d, ry=%d\n", - x_white, y_white, x_red, y_red); - - fprintf(stderr, "gx=%d, gy=%d, bx=%d, by=%d\n", - x_green, y_green, x_blue, y_blue); -#endif /* PNG_CONSOLE_IO_SUPPORTED */ + png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_fixed, x_white); + png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_fixed, y_white); + png_warning_parameter_signed(p, 3, PNG_NUMBER_FORMAT_fixed, x_red); + png_warning_parameter_signed(p, 4, PNG_NUMBER_FORMAT_fixed, y_red); + png_warning_parameter_signed(p, 5, PNG_NUMBER_FORMAT_fixed, x_green); + png_warning_parameter_signed(p, 6, PNG_NUMBER_FORMAT_fixed, y_green); + png_warning_parameter_signed(p, 7, PNG_NUMBER_FORMAT_fixed, x_blue); + png_warning_parameter_signed(p, 8, PNG_NUMBER_FORMAT_fixed, y_blue); + + png_formatted_warning(png_ptr, p, + "Ignoring incorrect cHRM white(@1,@2) r(@3,@4)g(@5,@6)b(@7,@8) " + "when sRGB is also present"); } return; } #endif /* PNG_READ_sRGB_SUPPORTED */ @@ -1095,13 +1080,15 @@ if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)) { if (PNG_OUT_OF_RANGE(info_ptr->gamma, 45500L, 500)) { - png_warning(png_ptr, - "Ignoring incorrect gAMA value when sRGB is also present"); -#ifdef PNG_CONSOLE_IO_SUPPORTED - fprintf(stderr, "incorrect gamma=(%d/100000)\n", info_ptr->gamma); -#endif + PNG_WARNING_PARAMETERS(p) + + png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_fixed, + info_ptr->gamma); + + png_formatted_warning(png_ptr, p, + "Ignoring incorrect gAMA value @1 when sRGB is also present"); } } #endif /* PNG_READ_gAMA_SUPPORTED */ @@ -1239,25 +1226,17 @@ /* And the following guarantees that profile_size == profile_length. */ if (profile_size > profile_length) { + PNG_WARNING_PARAMETERS(p) + png_free(png_ptr, png_ptr->chunkdata); png_ptr->chunkdata = NULL; -#ifdef PNG_STDIO_SUPPORTED - { - char umsg[80]; - png_snprintf2(umsg, 80, - "Ignoring iCCP chunk with declared size = %u " - "and actual length = %u", - (unsigned int) profile_size, - (unsigned int) profile_length); - png_warning(png_ptr, umsg); - } -#else - png_warning(png_ptr, - "Ignoring iCCP chunk with uncompressed size mismatch"); -#endif + png_warning_parameter_unsigned(p, 1, PNG_NUMBER_FORMAT_u, profile_size); + png_warning_parameter_unsigned(p, 2, PNG_NUMBER_FORMAT_u, profile_length); + png_formatted_warning(png_ptr, p, + "Ignoring iCCP chunk with declared size = @1 and actual length = @2"); return; } png_set_iCCP(png_ptr, info_ptr, png_ptr->chunkdata, @@ -3397,9 +3376,11 @@ png_size_t row_bytes; png_debug(1, "in png_read_start_row"); png_ptr->zstream.avail_in = 0; +#ifdef PNG_READ_TRANSFORMS_SUPPORTED png_init_read_transformations(png_ptr); +#endif #ifdef PNG_READ_INTERLACING_SUPPORTED if (png_ptr->interlaced) { if (!(png_ptr->transformations & PNG_INTERLACE)) diff -ru4NwbB libpng-1.5.2/pngstruct.h libpng-1.5.3beta06/pngstruct.h --- libpng-1.5.2/pngstruct.h 2011-03-31 11:23:40.673577111 -0500 +++ libpng-1.5.3beta06/pngstruct.h 2011-05-07 21:41:06.867718769 -0500 @@ -4,9 +4,9 @@ * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * - * Last changed in libpng 1.5.0 [January 6, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer * and license in png.h @@ -28,13 +28,15 @@ struct png_struct_def { #ifdef PNG_SETJMP_SUPPORTED - jmp_buf png_jmpbuf; /* used in png_error */ + jmp_buf longjmp_buffer; /* used in png_error */ png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */ #endif png_error_ptr error_fn; /* function for printing errors and aborting */ +#ifdef PNG_WARNINGS_SUPPORTED png_error_ptr warning_fn; /* function for printing warnings */ +#endif png_voidp error_ptr; /* user supplied struct for error functions */ png_rw_ptr write_data_fn; /* function for writing output data */ png_rw_ptr read_data_fn; /* function for reading input data */ png_voidp io_ptr; /* ptr to application struct for I/O functions */ @@ -63,13 +65,38 @@ z_stream zstream; /* pointer to decompression structure (below) */ png_bytep zbuf; /* buffer for zlib */ uInt zbuf_size; /* size of zbuf (typically 65536) */ +#ifdef PNG_WRITE_SUPPORTED + +/* Added in 1.5.3: state to keep track of whether the zstream has been + * initialized and if so whether it is for IDAT or some other chunk. + */ +#define PNG_ZLIB_UNINITIALIZED 0 +#define PNG_ZLIB_FOR_IDAT 1 +#define PNG_ZLIB_FOR_TEXT 2 /* anything other than IDAT */ +#define PNG_ZLIB_USE_MASK 3 /* bottom two bits */ +#define PNG_ZLIB_IN_USE 4 /* a flag value */ + + png_uint_32 zlib_state; /* State of zlib initialization */ +/* End of material added at libpng 1.5.3 */ + int zlib_level; /* holds zlib compression level */ int zlib_method; /* holds zlib compression method */ int zlib_window_bits; /* holds zlib compression window bits */ int zlib_mem_level; /* holds zlib compression memory level */ int zlib_strategy; /* holds zlib compression strategy */ +#endif +/* Added at libpng 1.5.3 */ +#if defined(PNG_WRITE_COMPRESSED_TEXT_SUPPORTED) || \ + defined(PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION) + int zlib_text_level; /* holds zlib compression level */ + int zlib_text_method; /* holds zlib compression method */ + int zlib_text_window_bits; /* holds zlib compression window bits */ + int zlib_text_mem_level; /* holds zlib compression memory level */ + int zlib_text_strategy; /* holds zlib compression strategy */ +#endif +/* End of material added at libpng 1.5.3 */ png_uint_32 width; /* width of image in pixels */ png_uint_32 height; /* height of image in pixels */ png_uint_32 num_rows; /* number of rows in current pass */ @@ -107,9 +134,10 @@ #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) png_uint_16 filler; /* filler bytes for pixel expansion */ #endif -#ifdef PNG_bKGD_SUPPORTED +#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ + defined(PNG_READ_ALPHA_MODE_SUPPORTED) png_byte background_gamma_type; png_fixed_point background_gamma; png_color_16 background; /* background color in screen gamma space */ #ifdef PNG_READ_GAMMA_SUPPORTED @@ -208,9 +236,9 @@ png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ #endif #ifdef PNG_TIME_RFC1123_SUPPORTED - png_charp time_buffer; /* String to hold RFC 1123 time text */ + char time_buffer[29]; /* String to hold RFC 1123 time text */ #endif /* New members added in libpng-1.0.6 */ diff -ru4NwbB libpng-1.5.2/pngtest.c libpng-1.5.3beta06/pngtest.c --- libpng-1.5.2/pngtest.c 2011-03-31 11:23:40.790873438 -0500 +++ libpng-1.5.3beta06/pngtest.c 2011-05-07 21:41:06.985769067 -0500 @@ -1,8 +1,8 @@ /* pngtest.c - a simple test program to test libpng * - * Last changed in libpng 1.5.0 [January 6, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -30,8 +30,10 @@ * testing a wide variety of files easily. You can also test a number * of files at once by typing "pngtest -m file1.png file2.png ..." */ +#define _POSIX_SOURCE 1 + #include "zlib.h" #include "png.h" /* Copied from pngpriv.h but only used in error messages below. */ #ifndef PNG_ZBUF_SIZE @@ -778,9 +780,9 @@ int num_pass, pass; int bit_depth, color_type; #ifdef PNG_SETJMP_SUPPORTED #ifdef USE_FAR_KEYWORD - jmp_buf png_jmpbuf; + jmp_buf tmp_jmpbuf; #endif #endif char inbuf[256], outbuf[256]; @@ -847,9 +849,9 @@ #ifdef PNG_SETJMP_SUPPORTED pngtest_debug("Setting jmpbuf for read struct"); #ifdef USE_FAR_KEYWORD - if (setjmp(png_jmpbuf)) + if (setjmp(tmp_jmpbuf)) #else if (setjmp(png_jmpbuf(read_ptr))) #endif { @@ -865,16 +867,16 @@ FCLOSE(fpout); return (1); } #ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(read_ptr), png_jmpbuf, png_sizeof(jmp_buf)); + png_memcpy(png_jmpbuf(read_ptr), tmp_jmpbuf, png_sizeof(jmp_buf)); #endif #ifdef PNG_WRITE_SUPPORTED pngtest_debug("Setting jmpbuf for write struct"); #ifdef USE_FAR_KEYWORD - if (setjmp(png_jmpbuf)) + if (setjmp(tmp_jmpbuf)) #else if (setjmp(png_jmpbuf(write_ptr))) #endif { @@ -889,9 +891,9 @@ return (1); } #ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(write_ptr), png_jmpbuf, png_sizeof(jmp_buf)); + png_memcpy(png_jmpbuf(write_ptr), tmp_jmpbuf, png_sizeof(jmp_buf)); #endif #endif #endif @@ -912,8 +914,16 @@ # endif # endif #endif +#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION + /* Normally one would use Z_DEFAULT_STRATEGY for text compression. + * This is here just to make pngtest replicate the results from libpng + * versions prior to 1.5.3, and to test this new API. + */ + png_set_text_compression_strategy(write_ptr, Z_FILTERED); +#endif + if (status_dots_requested == 1) { #ifdef PNG_WRITE_SUPPORTED png_set_write_status_fn(write_ptr, write_row_callback); diff -ru4NwbB libpng-1.5.2/pngtrans.c libpng-1.5.3beta06/pngtrans.c --- libpng-1.5.2/pngtrans.c 2011-03-31 11:23:40.797375493 -0500 +++ libpng-1.5.3beta06/pngtrans.c 2011-05-07 21:41:06.992287638 -0500 @@ -1,8 +1,8 @@ /* pngtrans.c - transforms the data in a row (used by both readers and writers) * - * Last changed in libpng 1.5.2 [March 31, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -441,9 +441,13 @@ /* At the start sp will point to the first byte to copy and dp to where * it is copied to. ep always points just beyond the end of the row, so * the loop simply copies (channels-1) channels until sp reaches ep. + * + * at_start: 0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc. + * nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc. */ + /* GA, GX, XG cases */ if (row_info->channels == 2) { if (row_info->bit_depth == 8) @@ -449,9 +453,9 @@ if (row_info->bit_depth == 8) { if (at_start) /* Skip initial filler */ ++sp; - else /* Skip initial channels and, for sp, the filler */ + else /* Skip initial channel and, for sp, the filler */ sp += 2, ++dp; /* For a 1 pixel wide image there is nothing to do */ while (sp < ep) @@ -461,11 +465,11 @@ } else if (row_info->bit_depth == 16) { - if (at_start) + if (at_start) /* Skip initial filler */ sp += 2; - else + else /* Skip initial channel and, for sp, the filler */ sp += 4, dp += 2; while (sp < ep) *dp++ = *sp++, *dp++ = *sp, sp += 3; @@ -501,11 +505,11 @@ } else if (row_info->bit_depth == 16) { - if (at_start) + if (at_start) /* Skip initial filler */ sp += 2; - else + else /* Skip initial channels and, for sp, the filler */ sp += 8, dp += 6; while (sp < ep) { diff -ru4NwbB libpng-1.5.2/pngvalid.c libpng-1.5.3beta06/pngvalid.c --- libpng-1.5.2/pngvalid.c 2011-03-31 11:23:40.818304211 -0500 +++ libpng-1.5.3beta06/pngvalid.c 2011-05-07 21:41:07.015286276 -0500 @@ -1,8 +1,8 @@ /* pngvalid.c - validate libpng by constructing then reading png files. * - * Last changed in libpng 1.5.2 [March 31, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 2011 Glenn Randers-Pehrson * Written by John Cunningham Bowler * * This code is released under the libpng license. @@ -18,8 +18,10 @@ * The program can be modified and extended to test the correctness of * transformations performed by libpng. */ +#define _POSIX_SOURCE 1 + #include "png.h" #if PNG_LIBPNG_VER < 10500 /* This delibarately lacks the PNG_CONST. */ typedef png_byte *png_const_bytep; @@ -45,11 +47,15 @@ ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1) #define PNG_COL_IN_INTERLACE_PASS(x, pass) \ ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1) -/* These are needed too for the defualt build: */ +/* These are needed too for the default build: */ #define PNG_WRITE_16BIT_SUPPORTED #define PNG_READ_16BIT_SUPPORTED + +/* This comes from pnglibconf.h afer 1.5: */ +#define PNG_GAMMA_THRESHOLD_FIXED\ + ((png_fixed_point)(PNG_GAMMA_THRESHOLD * 100000)) #endif #include "zlib.h" /* For crc32 */ @@ -107,15 +113,17 @@ sprintf(number, "%d", n); return safecat(buffer, bufsize, pos, number); } +#ifdef PNG_READ_TRANSFORMS_SUPPORTED static size_t safecatd(char *buffer, size_t bufsize, size_t pos, double d, int precision) { char number[64]; sprintf(number, "%.*f", precision, d); return safecat(buffer, bufsize, pos, number); } +#endif static PNG_CONST char invalid[] = "invalid"; static PNG_CONST char sep[] = ": "; @@ -224,8 +232,9 @@ #ifndef DO_16BIT # define READ_BDHI 3 #endif +#ifdef PNG_READ_TRANSFORMS_SUPPORTED static int next_format(png_bytep colour_type, png_bytep bit_depth) { if (*bit_depth == 0) @@ -289,10 +298,11 @@ if (colour_type & 4) bit_index += x; /* Alpha channel */ + /* Multiple channels; select one: */ if (colour_type & (2+4)) - bit_index += sample_index * bit_depth; /* Multiple channels: select one */ + bit_index += sample_index * bit_depth; } /* Return the sample from the row as an integer. */ row += bit_index >> 3; @@ -307,8 +317,9 @@ /* Less than 8 bits per sample. */ bit_index &= 7; return (result >> (8-bit_index-bit_depth)) & ((1U<current->datacount; } +#ifdef PNG_READ_TRANSFORMS_SUPPORTED /* Return total bytes available for read. */ static size_t store_read_buffer_avail(png_store *ps) { @@ -812,8 +826,9 @@ } return 0; } +#endif static int store_read_buffer_next(png_store *ps) { @@ -1309,11 +1324,13 @@ * below. */ double maxout8; /* Maximum output value error */ double maxabs8; /* Absolute sample error 0..1 */ + double maxcalc8; /* Absolute sample error 0..1 */ double maxpc8; /* Percentage sample error 0..100% */ double maxout16; /* Maximum output value error */ double maxabs16; /* Absolute sample error 0..1 */ + double maxcalc16;/* Absolute sample error 0..1 */ double maxpc16; /* Percentage sample error 0..100% */ /* Logged 8 and 16 bit errors ('output' values): */ double error_gray_2; @@ -1340,13 +1357,19 @@ unsigned int use_input_precision :1; unsigned int use_input_precision_sbit :1; unsigned int use_input_precision_16to8 :1; + /* Whether to allow for low bit depth composition errors: */ + unsigned int use_linear_precision :1; + /* Which gamma tests to run: */ unsigned int test_gamma_threshold :1; unsigned int test_gamma_transform :1; /* main tests */ unsigned int test_gamma_sbit :1; unsigned int test_gamma_strip16 :1; + unsigned int test_gamma_background :1; + unsigned int test_gamma_alpha_mode :1; + unsigned int test_gamma_expand16 :1; unsigned int log :1; /* Log max error */ /* Buffer information, the buffer size limits the size of the chunks that can @@ -1357,37 +1380,8 @@ size_t buffer_position; /* Position in buffer */ png_byte buffer[1024]; } png_modifier; -static double abserr(png_modifier *pm, png_byte bit_depth) -{ - return bit_depth == 16 ? pm->maxabs16 : pm->maxabs8; -} - -static double pcerr(png_modifier *pm, png_byte bit_depth) -{ - return (bit_depth == 16 ? pm->maxpc16 : pm->maxpc8) * .01; -} - -static double outerr(png_modifier *pm, png_byte bit_depth) -{ - /* There is a serious error in the 2 and 4 bit grayscale transform because - * the gamma table value (8 bits) is simply shifted, not rounded, so the - * error in 4 bit greyscale gamma is up to the value below. This is a hack - * to allow pngvalid to succeed: - */ - if (bit_depth == 2) - return .73182-.5; - - if (bit_depth == 4) - return .90644-.5; - - if (bit_depth == 16) - return pm->maxout16; - - return pm->maxout8; -} - /* This returns true if the test should be stopped now because it has already * failed and it is running silently. */ static int fail(png_modifier *pm) @@ -1403,10 +1397,12 @@ store_init(&pm->this); pm->modifications = NULL; pm->state = modifier_start; pm->sbitlow = 1U; - pm->maxout8 = pm->maxpc8 = pm->maxabs8 = 0; - pm->maxout16 = pm->maxpc16 = pm->maxabs16 = 0; + pm->ngammas = 0; + pm->gammas = 0; + pm->maxout8 = pm->maxpc8 = pm->maxabs8 = pm->maxcalc8 = 0; + pm->maxout16 = pm->maxpc16 = pm->maxabs16 = pm->maxcalc16 = 0; pm->error_gray_2 = pm->error_gray_4 = pm->error_gray_8 = 0; pm->error_gray_16 = pm->error_color_8 = pm->error_color_16 = 0; pm->interlace_type = PNG_INTERLACE_NONE; pm->test_standard = 0; @@ -1414,17 +1410,63 @@ pm->test_transform = 0; pm->use_input_precision = 0; pm->use_input_precision_sbit = 0; pm->use_input_precision_16to8 = 0; + pm->use_linear_precision = 0; pm->test_gamma_threshold = 0; pm->test_gamma_transform = 0; pm->test_gamma_sbit = 0; pm->test_gamma_strip16 = 0; + pm->test_gamma_background = 0; + pm->test_gamma_alpha_mode = 0; + pm->test_gamma_expand16 = 0; pm->log = 0; /* Rely on the memset for all the other fields - there are no pointers */ } +#ifdef PNG_READ_TRANSFORMS_SUPPORTED +static double abserr(png_modifier *pm, png_byte bit_depth) +{ + return bit_depth == 16 ? pm->maxabs16 : pm->maxabs8; +} + +static double calcerr(png_modifier *pm, png_byte bit_depth) +{ + /* This exists because libpng uses linear transformations in the original bit + * depth when performing background composition. This introduces significant + * errors for low values: + */ + if (pm->use_linear_precision) + return bit_depth == 16 ? pm->maxcalc16 : pm->maxcalc8; + else + return bit_depth == 16 ? pm->maxabs16 : pm->maxabs8; +} + +static double pcerr(png_modifier *pm, png_byte bit_depth) +{ + return (bit_depth == 16 ? pm->maxpc16 : pm->maxpc8) * .01; +} + +static double outerr(png_modifier *pm, png_byte bit_depth) +{ + /* There is a serious error in the 2 and 4 bit grayscale transform because + * the gamma table value (8 bits) is simply shifted, not rounded, so the + * error in 4 bit greyscale gamma is up to the value below. This is a hack + * to allow pngvalid to succeed: + */ + if (bit_depth == 2) + return .73182-.5; + + if (bit_depth == 4) + return .90644-.5; + + if (bit_depth == 16) + return pm->maxout16; + + return pm->maxout8; +} + /* One modification structure must be provided for each chunk to be modified (in * fact more than one can be provided if multiple separate changes are desired * for a single chunk.) Modifications include adding a new chunk when a * suitable chunk does not exist. @@ -1812,8 +1854,9 @@ pm->buffer_position = 0; return set_store_for_read(&pm->this, ppi, id, name); } +#endif /* PNG_READ_TRANSFORMS_SUPPORTED */ /***************************** STANDARD PNG FILES *****************************/ /* Standard files - write and save standard files. */ /* There are two basic forms of standard images. Those which attempt to have @@ -2110,16 +2153,40 @@ png_set_IHDR(pp, pi, transform_width(pp, colour_type, bit_depth), h, bit_depth, colour_type, interlace_type, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); +#ifdef PNG_TEXT_SUPPORTED + { + static char key[] = "image name"; /* must be writeable */ + size_t pos; + png_text text; + char copy[FILE_NAME_SIZE]; + + /* Use a compressed text string to test the correct interaction of text + * compression and IDAT compression. + */ + text.compression = PNG_TEXT_COMPRESSION_zTXt; + text.key = key; + /* Yuck: the text must be writable! */ + pos = safecat(copy, sizeof copy, 0, ps->wname); + text.text = copy; + text.text_length = pos; + text.itxt_length = 0; + text.lang = 0; + text.lang_key = 0; + + png_set_text(pp, pi, &text, 1); + } +#endif + if (colour_type == 3) /* palette */ { unsigned int i = 0; png_color pal[256]; do pal[i].red = pal[i].green = pal[i].blue = (png_byte)i; - while(++i < 256U); + while(++i < 256); png_set_PLTE(pp, pi, pal, 256); } @@ -2154,8 +2221,29 @@ } } } +#ifdef PNG_TEXT_SUPPORTED + { + static char key[] = "end marker"; + static char comment[] = "end"; + png_text text; + + /* Use a compressed text string to test the correct interaction of text + * compression and IDAT compression. + */ + text.compression = PNG_TEXT_COMPRESSION_zTXt; + text.key = key; + text.text = comment; + text.text_length = (sizeof comment)-1; + text.itxt_length = 0; + text.lang = 0; + text.lang_key = 0; + + png_set_text(pp, pi, &text, 1); + } +#endif + png_write_end(pp, pi); /* And store this under the appropriate id, then clean up. */ store_storefile(ps, FILEID(colour_type, bit_depth, interlace_type, @@ -2479,8 +2567,9 @@ /* Like 'make_standard' but errors are deliberately introduced into the calls * to ensure that they get detected - it should not be possible to write an * invalid image with libpng! */ +#ifdef PNG_WARNINGS_SUPPORTED static void sBIT0_error_fn(png_structp pp, png_infop pi) { /* 0 is invalid... */ @@ -2513,8 +2602,9 @@ PNG_CONST char *msg; unsigned int warning :1; /* the error is a warning... */ } error_test[] = { + /* no warnings makes these errors undetectable. */ { sBIT0_error_fn, "sBIT(0): failed to detect error", 1 }, { sBIT_error_fn, "sBIT(too big): failed to detect error", 1 }, }; @@ -2656,12 +2746,14 @@ } return 1; /* keep going */ } +#endif static void perform_error_test(png_modifier *pm) { +#ifdef PNG_WARNINGS_SUPPORTED /* else there are no cases that work! */ /* Need to do this here because we just write in this test. */ safecat(pm->this.test, sizeof pm->this.test, 0, "error test"); if (!make_errors(pm, 0, 0, WRITE_BDHI)) @@ -2677,8 +2769,75 @@ return; if (!make_errors(pm, 6, 3, WRITE_BDHI)) return; +#else + UNUSED(pm) +#endif +} + +/* This is just to validate the internal PNG formatting code - if this fails + * then the warning messages the library outputs will probably be garbage. + */ +static void +perform_formatting_test(png_store *volatile ps) +{ +#ifdef PNG_TIME_RFC1123_SUPPORTED + /* The handle into the formatting code is the RFC1123 support; this test does + * nothing if that is compiled out. + */ + context(ps, fault); + + Try + { + png_const_charp correct = "29 Aug 2079 13:53:60 +0000"; + png_const_charp result; + png_structp pp; + png_time pt; + + pp = set_store_for_write(ps, NULL, "libpng formatting test"); + + if (pp == NULL) + Throw ps; + + + /* Arbitrary settings: */ + pt.year = 2079; + pt.month = 8; + pt.day = 29; + pt.hour = 13; + pt.minute = 53; + pt.second = 60; /* a leap second */ + + result = png_convert_to_rfc1123(pp, &pt); + + if (result == NULL) + png_error(pp, "png_convert_to_rfc1123 failed"); + + if (strcmp(result, correct) != 0) + { + size_t pos = 0; + char msg[128]; + + pos = safecat(msg, sizeof msg, pos, "png_convert_to_rfc1123("); + pos = safecat(msg, sizeof msg, pos, correct); + pos = safecat(msg, sizeof msg, pos, ") returned: '"); + pos = safecat(msg, sizeof msg, pos, result); + pos = safecat(msg, sizeof msg, pos, "'"); + + png_error(pp, msg); + } + + store_write_reset(ps); + } + + Catch(fault) + { + store_write_reset(fault); + } +#else + UNUSED(ps) +#endif } /* Because we want to use the same code in both the progressive reader and the * sequential reader it is necessary to deal with the fact that the progressive @@ -2747,9 +2906,9 @@ { dp->ps = ps; dp->colour_type = COL_FROM_ID(id); dp->bit_depth = DEPTH_FROM_ID(id); - dp->alpha_sBIT = dp->blue_sBIT = dp->green_sBIT = dp->alpha_sBIT = + dp->red_sBIT = dp->blue_sBIT = dp->green_sBIT = dp->alpha_sBIT = dp->bit_depth; dp->interlace_type = INTERLACE_FROM_ID(id); dp->id = id; /* All the rest are filled in after the read_info: */ @@ -3072,14 +3230,16 @@ * us the y in the sub-image: */ if (dp->do_interlace && dp->interlace_type == PNG_INTERLACE_ADAM7) { +#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED /* Use this opportunity to validate the png 'current' APIs: */ if (y != png_get_current_row_number(pp)) png_error(pp, "png_get_current_row_number is broken"); if (pass != png_get_current_pass_number(pp)) png_error(pp, "png_get_current_pass_number is broken"); +#endif y = PNG_ROW_FROM_PASS_ROW(y, pass); } @@ -3470,8 +3630,9 @@ } /******************************* TRANSFORM TESTS ******************************/ +#ifdef PNG_READ_TRANSFORMS_SUPPORTED /* A set of tests to validate libpng image transforms. The possibilities here * are legion because the transforms can be combined in a combinatorial * fashion. To deal with this some measure of restraint is required, otherwise * the tests would take forever. @@ -4009,14 +4170,15 @@ { /* Compare the scaled, digitzed, values of our local calculation (in+-err) * with the digitized values libpng produced; 'sample_depth' is the actual * digitization depth of the libpng output colors (the bit depth except for - * palette images where it is always 8.) + * palette images where it is always 8.) The check on 'err' is to detect + * internal errors in pngvalid itself (the threshold is about 1/255.) */ unsigned int max = (1U<= in_min && out <= in_max)) + if (err > 4E-3 || !(out >= in_min && out <= in_max)) { char message[256]; size_t pos; @@ -4227,21 +4389,22 @@ } /* The transforms: */ #define ITSTRUCT(name) image_transform_##name -#define IT(name,prev)\ +#define IT(name)\ static image_transform ITSTRUCT(name) =\ {\ #name,\ 1, /*enable*/\ - &ITSTRUCT(prev), /*list*/\ + &PT, /*list*/\ 0, /*global_use*/\ 0, /*local_use*/\ 0, /*next*/\ image_transform_png_set_##name##_set,\ image_transform_png_set_##name##_mod,\ image_transform_png_set_##name##_add\ } +#define PT ITSTRUCT(end) /* stores the previous transform */ /* To save code: */ static int image_transform_default_add(image_transform *this, @@ -4255,8 +4418,9 @@ return 1; } +#ifdef PNG_READ_EXPAND_SUPPORTED /* png_set_palette_to_rgb */ static void image_transform_png_set_palette_to_rgb_set(PNG_CONST image_transform *this, transform_display *that, png_structp pp, png_infop pi) @@ -4286,11 +4450,14 @@ return colour_type == PNG_COLOR_TYPE_PALETTE; } -IT(palette_to_rgb, end); - +IT(palette_to_rgb); +#undef PT +#define PT ITSTRUCT(palette_to_rgb) +#endif /* PNG_READ_EXPAND_SUPPORTED */ +#ifdef PNG_READ_EXPAND_SUPPORTED /* png_set_tRNS_to_alpha */ static void image_transform_png_set_tRNS_to_alpha_set(PNG_CONST image_transform *this, transform_display *that, png_structp pp, png_infop pi) @@ -4340,10 +4507,14 @@ */ return (colour_type & PNG_COLOR_MASK_ALPHA) == 0; } -IT(tRNS_to_alpha,palette_to_rgb); +IT(tRNS_to_alpha); +#undef PT +#define PT ITSTRUCT(tRNS_to_alpha) +#endif /* PNG_READ_EXPAND_SUPPORTED */ +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED /* png_set_gray_to_rgb */ static void image_transform_png_set_gray_to_rgb_set(PNG_CONST image_transform *this, transform_display *that, png_structp pp, png_infop pi) @@ -4394,10 +4565,14 @@ return (colour_type & PNG_COLOR_MASK_COLOR) == 0; } -IT(gray_to_rgb,tRNS_to_alpha); +IT(gray_to_rgb); +#undef PT +#define PT ITSTRUCT(gray_to_rgb) +#endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED */ +#ifdef PNG_READ_EXPAND_SUPPORTED /* png_set_expand */ static void image_transform_png_set_expand_set(PNG_CONST image_transform *this, transform_display *that, png_structp pp, png_infop pi) @@ -4436,10 +4611,14 @@ */ return (colour_type & PNG_COLOR_MASK_ALPHA) == 0; } -IT(expand,gray_to_rgb); +IT(expand); +#undef PT +#define PT ITSTRUCT(expand) +#endif /* PNG_READ_EXPAND_SUPPORTED */ +#ifdef PNG_READ_EXPAND_SUPPORTED /* png_set_expand_gray_1_2_4_to_8 * LIBPNG BUG: this just does an 'expand' */ static void @@ -4466,9 +4645,14 @@ return image_transform_png_set_expand_add(this, that, colour_type, bit_depth); } -IT(expand_gray_1_2_4_to_8, expand); +IT(expand_gray_1_2_4_to_8); +#undef PT +#define PT ITSTRUCT(expand_gray_1_2_4_to_8) +#endif /* PNG_READ_EXPAND_SUPPORTED */ + +#ifdef PNG_READ_EXPAND_16_SUPPORTED /* png_set_expand_16 */ static void image_transform_png_set_expand_16_set(PNG_CONST image_transform *this, transform_display *that, png_structp pp, png_infop pi) @@ -4508,10 +4692,14 @@ /* expand_16 does something unless the bit depth is already 16. */ return bit_depth < 16; } -IT(expand_16, expand_gray_1_2_4_to_8); +IT(expand_16); +#undef PT +#define PT ITSTRUCT(expand_16) +#endif /* PNG_READ_EXPAND_16_SUPPORTED */ +#ifdef PNG_READ_16_TO_8_SUPPORTED /* png_set_strip_16 */ static void image_transform_png_set_strip_16_set(PNG_CONST image_transform *this, transform_display *that, png_structp pp, png_infop pi) @@ -4560,10 +4748,14 @@ return bit_depth > 8; } -IT(strip_16, expand_16); +IT(strip_16); +#undef PT +#define PT ITSTRUCT(strip_16) +#endif /* PNG_READ_16_TO_8_SUPPORTED */ +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED /* png_set_strip_alpha */ static void image_transform_png_set_strip_alpha_set(PNG_CONST image_transform *this, transform_display *that, png_structp pp, png_infop pi) @@ -4599,10 +4791,14 @@ return (colour_type & PNG_COLOR_MASK_ALPHA) != 0; } -IT(strip_alpha,strip_16); +IT(strip_alpha); +#undef PT +#define PT ITSTRUCT(strip_alpha) +#endif /* PNG_READ_STRIP_ALPHA_SUPPORTED */ +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED /* png_set_rgb_to_gray(png_structp, int err_action, double red, double green) * png_set_rgb_to_gray_fixed(png_structp, int err_action, png_fixed_point red, * png_fixed_point green) * png_get_rgb_to_gray_status @@ -4676,10 +4872,14 @@ return (colour_type & PNG_COLOR_MASK_COLOR) != 0; } -IT(rgb_to_gray,strip_alpha); +IT(rgb_to_gray); +#undef PT +#define PT ITSTRUCT(rgb_to_gray) +#endif /* PNG_READ_RGB_TO_GRAY_SUPPORTED */ +#ifdef PNG_READ_BACKGROUND_SUPPORTED /* png_set_background(png_structp, png_const_color_16p background_color, * int background_gamma_code, int need_expand, double background_gamma) * png_set_background_fixed(png_structp, png_const_color_16p background_color, * int background_gamma_code, int need_expand, @@ -4694,17 +4894,18 @@ png_color_16 back; /* Since we don't know the output bit depth at this point we must use the * input values and ask libpng to expand the chunk as required. + * NOTE: the palette case isn't tested yet because there is no tRNS chunk! */ - back.index = 255; /* Should not be used */ + back.index = 128; /* The palette entry with rgb(128,128,128) */ back.gray = back.blue = back.green = back.red = (png_uint_16)((1U << that->this.bit_depth) >> 1); # ifdef PNG_FLOATING_POINT_SUPPORTED - png_set_background(pp, &back, PNG_BACKGROUND_GAMMA_FILE, 1, 0); + png_set_background(pp, &back, PNG_BACKGROUND_GAMMA_FILE, 1/*need expand*/, 0); # else - png_set_background_fixed(pp, &back, PNG_BACKGROUND_GAMMA_FILE, 1, 0); + png_set_background_fixed(pp, &back, PNG_BACKGROUND_GAMMA_FILE, 1/*need expand*/, 0); # endif this->next->set(this->next, that, pp, pi); } @@ -4759,11 +4960,15 @@ } #define image_transform_png_set_background_add image_transform_default_add -IT(background,rgb_to_gray); +IT(background); +#undef PT +#define PT ITSTRUCT(background) +#endif /* PNG_READ_BACKGROUND_SUPPORTED */ -static image_transform *PNG_CONST image_transform_first = &ITSTRUCT(background); +/* This may just be 'end' if all the transforms are disabled! */ +static image_transform *PNG_CONST image_transform_first = &PT; static void transform_enable(PNG_CONST char *name) { @@ -5070,11 +5275,13 @@ if (!test_transform(pm, 6, 3, READ_BDHI, 1)) return; } +#endif /* PNG_READ_TRANSFORMS_SUPPORTED */ /********************************* GAMMA TESTS ********************************/ +#ifdef PNG_READ_GAMMA_SUPPORTED /* Gamma test images. */ typedef struct gamma_modification { png_modification this; @@ -5225,38 +5432,52 @@ /* Parameters */ png_modifier* pm; double file_gamma; double screen_gamma; + double background_gamma; png_byte sbit; int threshold_test; - PNG_CONST char* name; int speed; int use_input_precision; int strip16; + int expand16; + int do_background; + png_color_16 background_color; /* Local variables */ double maxerrout; double maxerrpc; double maxerrabs; } gamma_display; +#define ALPHA_MODE_OFFSET 4 + static void gamma_display_init(gamma_display *dp, png_modifier *pm, png_uint_32 id, double file_gamma, double screen_gamma, png_byte sbit, int threshold_test, - int speed, int use_input_precision, int strip16) + int speed, int use_input_precision, int strip16, int expand16, + int do_background, PNG_CONST png_color_16 *pointer_to_the_background_color, + double background_gamma) { /* Standard fields */ standard_display_init(&dp->this, &pm->this, id, 0/*do_interlace*/); /* Parameter fields */ dp->pm = pm; dp->file_gamma = file_gamma; dp->screen_gamma = screen_gamma; + dp->background_gamma = background_gamma; dp->sbit = sbit; dp->threshold_test = threshold_test; dp->speed = speed; dp->use_input_precision = use_input_precision; dp->strip16 = strip16; + dp->expand16 = expand16; + dp->do_background = do_background; + if (do_background && pointer_to_the_background_color != 0) + dp->background_color = *pointer_to_the_background_color; + else + memset(&dp->background_color, 0, sizeof dp->background_color); /* Local variable fields */ dp->maxerrout = dp->maxerrpc = dp->maxerrabs = 0; } @@ -5278,8 +5499,92 @@ # else png_error(pp, "strip16 (16 to 8 bit conversion) not supported"); # endif + if (dp->expand16) +# ifdef PNG_READ_EXPAND_16_SUPPORTED + png_set_expand_16(pp); +# else + png_error(pp, "expand16 (8 to 16 bit conversion) not supported"); +# endif + + if (dp->do_background >= ALPHA_MODE_OFFSET) + { +# ifdef PNG_READ_ALPHA_MODE_SUPPORTED + { + /* This tests the alpha mode handling, if supported. */ + int mode = dp->do_background - ALPHA_MODE_OFFSET; + + /* The gamma value is the output gamma, and is in the standard, + * non-inverted, represenation. It provides a default for the PNG file + * gamma, but since the file has a gAMA chunk this does not matter. + */ + PNG_CONST double sg = dp->screen_gamma; +# ifndef PNG_FLOATING_POINT_SUPPORTED + PNG_CONST png_fixed_point g = (png_fixed_point)(sg*100000+.5); +# endif + +# ifdef PNG_FLOATING_POINT_SUPPORTED + png_set_alpha_mode(pp, mode, sg); +# else + png_set_alpha_mode_fixed(pp, mode, g); +# endif + + /* However, for the standard Porter-Duff algorithm the output defaults + * to be linear, so if the test requires non-linear output it must be + * corrected here. + */ + if (mode == PNG_ALPHA_STANDARD && sg != 1) + { +# ifdef PNG_FLOATING_POINT_SUPPORTED + png_set_gamma(pp, sg, dp->file_gamma); +# else + png_fixed_point f = (png_fixed_point)(dp->file_gamma*100000+.5); + png_set_gamma_fixed(pp, g, f); +# endif + } + } +# else + png_error(pp, "alpha mode handling not supported"); +# endif + } + + else + { + /* Set up gamma processing. */ +# ifdef PNG_FLOATING_POINT_SUPPORTED + png_set_gamma(pp, dp->screen_gamma, dp->file_gamma); +# else + { + png_fixed_point s = (png_fixed_point)(dp->screen_gamma*100000+.5); + png_fixed_point f = (png_fixed_point)(dp->file_gamma*100000+.5); + png_set_gamma_fixed(pp, s, f); + } +# endif + + if (dp->do_background) + { +# ifdef PNG_READ_BACKGROUND_SUPPORTED + /* NOTE: this assumes the caller provided the correct background gamma! + */ + PNG_CONST double bg = dp->background_gamma; +# ifndef PNG_FLOATING_POINT_SUPPORTED + PNG_CONST png_fixed_point g = (png_fixed_point)(bg*100000+.5); +# endif + +# ifdef PNG_FLOATING_POINT_SUPPORTED + png_set_background(pp, &dp->background_color, dp->do_background, + 0/*need_expand*/, bg); +# else + png_set_background_fixed(pp, &dp->background_color, + dp->do_background, 0/*need_expand*/, g); +# endif +# else + png_error(pp, "png_set_background not supported"); +# endif + } + } + png_read_update_info(pp, pi); /* Now we may get a different cbRow: */ standard_info_part2(&dp->this, pp, pi, 1 /*images*/); @@ -5290,258 +5595,639 @@ { gamma_info_imp(png_get_progressive_ptr(pp), pp, pi); } +/* Validate a single component value - the routine gets the input and output + * sample values as unscaled PNG component values along with a cache of all the + * information required to validate the values. + */ +typedef struct validate_info +{ + png_structp pp; + gamma_display *dp; + png_byte sbit; + int use_input_precision; + int do_background; + int strip16; + unsigned int sbit_max; + unsigned int isbit_shift; + unsigned int outmax; + + double gamma_correction; /* Overall correction required. */ + double file_inverse; /* Inverse of file gamma. */ + double screen_gamma; + double screen_inverse; /* Inverse of screen gamma. */ + + double background_red; /* Linear background value, red or gray. */ + double background_green; + double background_blue; + + double maxabs; + double maxcalc; + double maxout; + double maxpc; +} +validate_info; + static void -gamma_image_validate(gamma_display *dp, png_structp pp, png_infop pi, - png_const_bytep pRow) +init_validate_info(validate_info *vi, gamma_display *dp, png_struct *pp, + PNG_CONST png_byte out_bd) { - /* Get some constants derived from the input and output file formats: */ - PNG_CONST png_byte sbit = dp->sbit; - PNG_CONST double file_gamma = dp->file_gamma; - PNG_CONST double screen_gamma = dp->screen_gamma; - PNG_CONST int use_input_precision = dp->use_input_precision; - PNG_CONST int speed = dp->speed; - PNG_CONST png_byte in_ct = dp->this.colour_type; - PNG_CONST png_byte in_bd = dp->this.bit_depth; - PNG_CONST png_uint_32 w = dp->this.w; - PNG_CONST png_uint_32 h = dp->this.h; - PNG_CONST size_t cbRow = dp->this.cbRow; - PNG_CONST png_byte out_ct = png_get_color_type(pp, pi); - PNG_CONST png_byte out_bd = png_get_bit_depth(pp, pi); PNG_CONST unsigned int outmax = (1U<pm, out_bd); - PNG_CONST double maxout = outerr(dp->pm, out_bd); - PNG_CONST double maxpc = pcerr(dp->pm, out_bd); - /* There are three sources of error, firstly the quantization in the - * file encoding, determined by sbit and/or the file depth, secondly - * the output (screen) gamma and thirdly the output file encoding. - * - * Since this API receives the screen and file gamma in double - * precision it is possible to calculate an exact answer given an input - * pixel value. Therefore we assume that the *input* value is exact - - * sample/maxsample - calculate the corresponding gamma corrected - * output to the limits of double precision arithmetic and compare with - * what libpng returns. - * - * Since the library must quantize the output to 8 or 16 bits there is - * a fundamental limit on the accuracy of the output of +/-.5 - this - * quantization limit is included in addition to the other limits - * specified by the paramaters to the API. (Effectively, add .5 - * everywhere.) - * - * The behavior of the 'sbit' paramter is defined by section 12.5 - * (sample depth scaling) of the PNG spec. That section forces the - * decoder to assume that the PNG values have been scaled if sBIT is - * present: - * - * png-sample = floor( input-sample * (max-out/max-in) + .5); - * - * This means that only a subset of the possible PNG values should - * appear in the input. However, the spec allows the encoder to use a - * variety of approximations to the above and doesn't require any - * restriction of the values produced. - * - * Nevertheless the spec requires that the upper 'sBIT' bits of the - * value stored in a PNG file be the original sample bits. - * Consequently the code below simply scales the top sbit bits by - * (1<= - PNG_GAMMA_THRESHOLD && !dp->threshold_test && !speed && in_ct != 3) || - in_bd != out_bd; + vi->pp = pp; + vi->dp = dp; + vi->sbit = dp->sbit; + vi->sbit_max = (1U << dp->sbit)-1; + vi->isbit_shift = (dp->this.bit_depth - dp->sbit); - PNG_CONST unsigned int samples_per_pixel = (out_ct & 2U) ? 3U : 1U; + /* This mimics the libpng threshold test, '0' is used to prevent gamma + * correction in the validation test. + */ + vi->screen_gamma = dp->screen_gamma; + if (fabs(vi->screen_gamma-1) < PNG_GAMMA_THRESHOLD) + vi->screen_gamma = vi->screen_inverse = 0; + else + vi->screen_inverse = 1/vi->screen_gamma; - PNG_CONST double gamma_correction = 1/(file_gamma*screen_gamma);/* Overall */ + vi->use_input_precision = dp->use_input_precision; + vi->outmax = outmax; + vi->maxabs = abserr(dp->pm, out_bd); + vi->maxcalc = calcerr(dp->pm, out_bd); + vi->maxout = outerr(dp->pm, out_bd); + vi->maxpc = pcerr(dp->pm, out_bd); - double maxerrout = 0, maxerrabs = 0, maxerrpc = 0; - png_uint_32 y; + if ((dp->this.colour_type & PNG_COLOR_MASK_ALPHA) != 0) + { + vi->do_background = dp->do_background; - for (y=0; ydo_background != 0) { - unsigned int s, x; - png_byte std[STANDARD_ROWMAX]; + PNG_CONST double bg_inverse = 1/dp->background_gamma; + double r, g, b; - transform_row(pp, std, in_ct, in_bd, y); + /* Caller must at least put the gray value into the red channel */ + r = dp->background_color.red; r /= outmax; + g = dp->background_color.green; g /= outmax; + b = dp->background_color.blue; b /= outmax; - if (processing) - { - for (x=0; x= PNG_GAMMA_THRESHOLD) +# endif { - /* Input sample values: */ - PNG_CONST unsigned int - id = sample(std, in_ct, in_bd, x, s); + r = pow(r, bg_inverse); + g = pow(g, bg_inverse); + b = pow(b, bg_inverse); + } - PNG_CONST unsigned int - od = sample(pRow, out_ct, out_bd, x, s); + vi->background_red = r; + vi->background_green = g; + vi->background_blue = b; + } + } + else + vi->do_background = 0; - PNG_CONST unsigned int - isbit = id >> (in_bd-sbit); + if (vi->do_background == 0) + vi->background_red = vi->background_green = vi->background_blue = 0; - double i, input_sample, encoded_sample, output; - double encoded_error, error; - double es_lo, es_hi; + vi->gamma_correction = 1/(dp->file_gamma*dp->screen_gamma); + if (fabs(vi->gamma_correction-1) < PNG_GAMMA_THRESHOLD) + vi->gamma_correction = 0; - /* First check on the 'perfect' result obtained from the - * digitized input value, id, and compare this against the - * actual digitized result, 'od'. 'i' is the input result - * in the range 0..1: + vi->file_inverse = 1/dp->file_gamma; + if (fabs(vi->file_inverse-1) < PNG_GAMMA_THRESHOLD) + vi->file_inverse = 0; + + vi->strip16 = dp->strip16; +} + +/* This API returns the encoded *input* component, in the range 0..1 */ +static double +gamma_component_validate(PNG_CONST char *name, PNG_CONST validate_info *vi, + PNG_CONST unsigned int id, PNG_CONST unsigned int od, + PNG_CONST double alpha /* <0 for the alpha channel itself */, + PNG_CONST double background /* component background value */) +{ + PNG_CONST unsigned int isbit = id >> vi->isbit_shift; + PNG_CONST unsigned int sbit_max = vi->sbit_max; + PNG_CONST unsigned int outmax = vi->outmax; + PNG_CONST int do_background = vi->do_background; + + double i; + + /* First check on the 'perfect' result obtained from the digitized input + * value, id, and compare this against the actual digitized result, 'od'. + * 'i' is the input result in the range 0..1: * - * NOTE: sBIT should be taken into account here but isn't, - * as described above. + * NOTE: sBIT should be taken into account here but isn't, as described + * below (next function). */ - i = isbit; i /= (1U<= 0 && vi->gamma_correction > 0) + encoded_sample = pow(encoded_sample, vi->gamma_correction); + encoded_sample *= outmax; + encoded_error = fabs(od-encoded_sample); - if (encoded_error > maxerrout) - maxerrout = encoded_error; + if (encoded_error > vi->dp->maxerrout) + vi->dp->maxerrout = encoded_error; - if (encoded_error < .5+maxout) - continue; + if (encoded_error < .5+vi->maxout) + return i; + } + + /* The slow route - attempt to do linear calculations. */ + /* There may be an error, or background processing is required, so calculate + * the actual sample values - unencoded light intensity values. Note that in + * practice these are not completely unencoded because they include a + * 'viewing correction' to decrease or (normally) increase the perceptual + * contrast of the image. There's nothing we can do about this - we don't + * know what it is - so assume the unencoded value is perceptually linear. + */ + { + double input_sample = i; /* In range 0..1 */ + double output, error, encoded_sample; + double es_lo, es_hi; + int compose = 0; /* Set to one if composition done */ + int output_is_encoded = 0; /* Set if encoded to screen gamma */ + int log_max_error = 1; /* Check maximum error values */ - /* There may be an error, so calculate the actual sample - * values - unencoded light intensity values. Note that - * in practice these are not unencoded because they - * include a 'viewing correction' to decrease or - * (normally) increase the perceptual contrast of the - * image. There's nothing we can do about this - we don't - * know what it is - so assume the unencoded value is - * perceptually linear. + /* Convert to linear light (with the above caveat.) The alpha channel is + * already linear. + */ + if (alpha >= 0 && vi->file_inverse > 0) + input_sample = pow(input_sample, vi->file_inverse); + + /* And similarly for the output value, but we need to check the background + * handling to linearize it correctly, so do that in the switch below. */ - input_sample = pow(i, 1/file_gamma); /* In range 0..1 */ output = od; output /= outmax; - output = pow(output, screen_gamma); - /* Now we have the numbers for real errors, both absolute - * values as as a percentage of the correct value (output): + /* If necessary handle the background processing - note that this does + * not need to do anything to the alpha channel, which starts out linear. + * First the alpha channel case. + */ + if (alpha < 0) switch (do_background) + { +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED + case ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN: + /* output alpha is gamma encoded */ + if (vi->screen_gamma > 0) + { + output = pow(output, vi->screen_gamma); + output_is_encoded = 1; + } + break; +#endif + + default: + /* In all other cases the output alpha channel is linear already, + * don't log errors here, they are much larger in linear data. + */ + log_max_error = 0; + break; + } + + /* Then the components. */ + else switch (do_background) + { + case PNG_BACKGROUND_GAMMA_SCREEN: + case PNG_BACKGROUND_GAMMA_FILE: + case PNG_BACKGROUND_GAMMA_UNIQUE: + /* Standard PNG background processing. */ + if (alpha < 1) + { + if (alpha > 0) + { + input_sample = input_sample * alpha + background * (1-alpha); + compose = 1; + } + + else + input_sample = background; + } + + /* Output is gamma encoded. */ + if (vi->screen_gamma > 0) + { + output = pow(output, vi->screen_gamma); + output_is_encoded = 1; + } + break; + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED + case ALPHA_MODE_OFFSET + PNG_ALPHA_STANDARD: + case ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN: + /* The components are premultiplied in either case and the output is + * gamma encoded (to get standard Porter-Duff we expect the output + * gamma to be set to 1.0!) + */ + if (alpha < 1) + { + if (alpha > 0) + { + input_sample *= alpha; + compose = 1; + } + + else + input_sample = 0; + } + + if (vi->screen_gamma > 0) + { + output = pow(output, vi->screen_gamma); + output_is_encoded = 1; + } + break; + + case ALPHA_MODE_OFFSET + PNG_ALPHA_OPTIMIZED: + /* The optimization is that the partial-alpha entries are linear + * while the opaque pixels are gamma encoded. + */ + if (alpha < 1) + { + if (alpha > 0) + { + input_sample *= alpha; + compose = 1; + /* Even though the screen may be non-linear the current + * component value remains linear, don't log errors in this + * case, they are irrelevant to overall perception: + */ + log_max_error = 0; + } + + else + input_sample = 0; + } + + /* Opaque pixel, so gamma encode it: */ + else if (vi->screen_gamma > 0) + { + output = pow(output, vi->screen_gamma); + output_is_encoded = 1; + } + break; +#endif + + default: + /* Standard cases where no compositing is done (so the component + * value is already correct.) The output is still gamma encoded. + */ + if (vi->screen_gamma > 0) + { + output = pow(output, vi->screen_gamma); + output_is_encoded = 1; + } + break; + } + + /* Calculate (or recalculate) the encoded_sample value and repeat the + * check above (unnecessary if we took the fast route, but harmless.) + */ + encoded_sample = input_sample; + if (output_is_encoded) + encoded_sample = pow(encoded_sample, vi->screen_inverse); + encoded_sample *= outmax; + + { + PNG_CONST double encoded_error = fabs(od-encoded_sample); + + /* Don't log errors in the alpha channel, or the 'optimized' case, + * neither are significant to the overall perception. + */ + if (log_max_error && encoded_error > vi->dp->maxerrout) + vi->dp->maxerrout = encoded_error; + + if (encoded_error < .5+vi->maxout) + return i; + } + + /* Now we have the numbers for real errors, both absolute values as as a + * percentage of the correct value (output): */ error = fabs(input_sample-output); - if (error > maxerrabs) - maxerrabs = error; + if (log_max_error && error > vi->dp->maxerrabs) + vi->dp->maxerrabs = error; - /* The following is an attempt to ignore the tendency of - * quantization to dominate the percentage errors for low - * output sample values: + /* The following is an attempt to ignore the tendency of quantization to + * dominate the percentage errors for low output sample values: */ - if (input_sample*maxpc > .5+maxabs) + if (log_max_error && input_sample*vi->maxpc > .5+vi->maxabs) { double percentage_error = error/input_sample; - if (percentage_error > maxerrpc) maxerrpc = percentage_error; + if (percentage_error > vi->dp->maxerrpc) + vi->dp->maxerrpc = percentage_error; } - /* Now calculate the digitization limits for - * 'encoded_sample' using the 'max' values. Note that - * maxout is in the encoded space but maxpc and maxabs are - * in linear light space. + /* Now calculate the digitization limits for 'encoded_sample' using the + * 'max' values. Note that maxout is in the encoded space but maxpc and + * maxabs are in linear light space. * - * First find the maximum error in linear light space, - * range 0..1: + * First find the maximum error in linear light space, range 0..1: */ { - double tmp = input_sample * maxpc; - if (tmp < maxabs) tmp = maxabs; + double tmp = input_sample * vi->maxpc; + if (tmp < vi->maxabs) tmp = vi->maxabs; + if (compose && tmp < vi->maxcalc) tmp = vi->maxcalc; - /* Low bound - the minimum of the three: */ - es_lo = encoded_sample - maxout; + /* Low bound - the minimum of the four: */ + es_lo = encoded_sample - vi->maxout; if (es_lo > 0 && input_sample-tmp > 0) { - double low_value = outmax * pow(input_sample-tmp, - 1/screen_gamma); + double low_value = input_sample-tmp; + if (output_is_encoded) + low_value = pow(low_value, vi->screen_inverse); + low_value *= outmax; if (low_value < es_lo) es_lo = low_value; } else es_lo = 0; - es_hi = encoded_sample + maxout; + es_hi = encoded_sample + vi->maxout; if (es_hi < outmax && input_sample+tmp < 1) { - double high_value = outmax * pow(input_sample+tmp, - 1/screen_gamma); + double high_value = input_sample+tmp; + if (output_is_encoded) + high_value = pow(high_value, vi->screen_inverse); + high_value *= outmax; if (high_value > es_hi) es_hi = high_value; } else es_hi = outmax; } - /* The primary test is that the final encoded value - * returned by the library should be between the two limits - * (inclusive) that were calculated above. At this point - * quantization of the output must be taken into account. + /* The primary test is that the final encoded value returned by the + * library should be between the two limits (inclusive) that were + * calculated above. At this point quantization of the output must be + * taken into account. */ if (od+.5 < es_lo || od-.5 > es_hi) { /* There has been an error in processing. */ double is_lo, is_hi; - if (use_input_precision) - { - /* Ok, something is wrong - this actually happens in - * current libpng sbit processing. Assume that the - * input value (id, adjusted for sbit) can be - * anywhere between value-.5 and value+.5 - quite a + /* NOTE: 'use_input_precision' is never set in background and alpha + * mode tests, if it ever is the following will be wrong because it + * doesn't do any of the compose handling! + */ + if (vi->use_input_precision) + { + /* Ok, something is wrong - this actually happens in current libpng + * sbit processing. Assume that the input value (id, adjusted for + * sbit) can be anywhere between value-.5 and value+.5 - quite a * large range if sbit is low. */ - double tmp = (isbit - .5)/((1U< 0) { - is_lo = outmax * pow(tmp, gamma_correction) - maxout; + if (alpha >= 0 && vi->gamma_correction > 0) + tmp = pow(tmp, vi->gamma_correction); + is_lo = outmax * tmp - vi->maxout; if (is_lo < 0) is_lo = 0; } else is_lo = 0; - tmp = (isbit + .5)/((1U<= 0 && vi->gamma_correction > 0) + tmp = pow(tmp, vi->gamma_correction); + is_hi = outmax * tmp + vi->maxout; if (is_hi > outmax) is_hi = outmax; } else is_hi = outmax; if (!(od+.5 < is_lo || od-.5 > is_hi)) - continue; + return i; + + /* One last chance. If this is an alpha channel and the 16to8 + * option has been used and 'inaccurate' scaling is used then the + * bit reduction is obtained by simply using the top 8 bits of the + * value. + */ +# ifndef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED + /* This may be required for other components in the future, but + * at present the presence of gamma correction effectively + * prevents the errors in the component scaling (I don't quite + * understand why, but since it's better this way I care not to + * ask, JB 20110419.) + */ + if (alpha < 0 && vi->strip16 && vi->sbit > 8 && + vi->sbit + vi->isbit_shift == 16) + { + tmp = ((id >> 8) - .5)/255; + + if (tmp > 0) + { + is_lo = outmax * tmp - vi->maxout; + if (is_lo < 0) is_lo = 0; + } + + else + is_lo = 0; + + tmp = ((id >> 8) + .5)/255; + + if (tmp < 1) + { + is_hi = outmax * tmp + vi->maxout; + if (is_hi > outmax) is_hi = outmax; } + else + is_hi = outmax; + + if (!(od+.5 < is_lo || od-.5 > is_hi)) + return i; + } +# endif + } + else /* !use_input_precision */ is_lo = es_lo, is_hi = es_hi; { char msg[256]; - sprintf(msg, - "error: %.3f; %u{%u;%u} -> %u not %.2f (%.1f-%.1f)", - od-encoded_sample, id, sbit, isbit, od, + sprintf(msg, "%s: %.3f; %u*%.3f{%u;%u} -> %u not %.2f (%.1f-%.1f)", + name, od-encoded_sample, id, alpha, vi->sbit, isbit, od, encoded_sample, is_lo, is_hi); - png_warning(pp, msg); +# ifdef PNG_WARNINGS_SUPPORTED + png_warning(vi->pp, msg); +# else + store_warning(vi->pp, msg); +# endif } } } + + return i; +} + +static void +gamma_image_validate(gamma_display *dp, png_structp pp, png_infop pi, + png_const_bytep pRow) +{ + /* Get some constants derived from the input and output file formats: */ + PNG_CONST int speed = dp->speed; + PNG_CONST png_byte in_ct = dp->this.colour_type; + PNG_CONST png_byte in_bd = dp->this.bit_depth; + PNG_CONST png_uint_32 w = dp->this.w; + PNG_CONST png_uint_32 h = dp->this.h; + PNG_CONST size_t cbRow = dp->this.cbRow; + PNG_CONST png_byte out_ct = png_get_color_type(pp, pi); + PNG_CONST png_byte out_bd = png_get_bit_depth(pp, pi); + + /* There are three sources of error, firstly the quantization in the + * file encoding, determined by sbit and/or the file depth, secondly + * the output (screen) gamma and thirdly the output file encoding. + * + * Since this API receives the screen and file gamma in double + * precision it is possible to calculate an exact answer given an input + * pixel value. Therefore we assume that the *input* value is exact - + * sample/maxsample - calculate the corresponding gamma corrected + * output to the limits of double precision arithmetic and compare with + * what libpng returns. + * + * Since the library must quantize the output to 8 or 16 bits there is + * a fundamental limit on the accuracy of the output of +/-.5 - this + * quantization limit is included in addition to the other limits + * specified by the paramaters to the API. (Effectively, add .5 + * everywhere.) + * + * The behavior of the 'sbit' paramter is defined by section 12.5 + * (sample depth scaling) of the PNG spec. That section forces the + * decoder to assume that the PNG values have been scaled if sBIT is + * present: + * + * png-sample = floor( input-sample * (max-out/max-in) + .5); + * + * This means that only a subset of the possible PNG values should + * appear in the input. However, the spec allows the encoder to use a + * variety of approximations to the above and doesn't require any + * restriction of the values produced. + * + * Nevertheless the spec requires that the upper 'sBIT' bits of the + * value stored in a PNG file be the original sample bits. + * Consequently the code below simply scales the top sbit bits by + * (1< 0 && !dp->threshold_test + && !speed && in_ct != 3) || in_bd != out_bd || in_ct != out_ct || + vi.do_background; + + for (y=0; y> vi.isbit_shift; + alpha /= vi.sbit_max; + } + } + + /* Handle greyscale or RGB components. */ + if ((in_ct & PNG_COLOR_MASK_COLOR) == 0) /* greyscale */ + (void)gamma_component_validate("gray", &vi, + sample(std, in_ct, in_bd, x, 0), + sample(pRow, out_ct, out_bd, x, 0), alpha/*component*/, + vi.background_red); + else + { + (void)gamma_component_validate("red", &vi, + sample(std, in_ct, in_bd, x, 0), + sample(pRow, out_ct, out_bd, x, 0), alpha/*component*/, + vi.background_red); + + (void)gamma_component_validate("green", &vi, + sample(std, in_ct, in_bd, x, 1), + sample(pRow, out_ct, out_bd, x, 1), alpha/*component*/, + vi.background_green); + + (void)gamma_component_validate("blue", &vi, + sample(std, in_ct, in_bd, x, 2), + sample(pRow, out_ct, out_bd, x, 2), alpha/*component*/, + vi.background_blue); + } + } } else if (!speed && memcmp(std, pRow, cbRow) != 0) { @@ -5553,11 +6239,8 @@ png_error(pp, msg); } } /* row (y) loop */ - dp->maxerrout = maxerrout; - dp->maxerrabs = maxerrabs; - dp->maxerrpc = maxerrpc; dp->this.ps->validated = 1; } static void @@ -5579,16 +6262,19 @@ PNG_CONST png_byte bit_depthIn, PNG_CONST int interlace_typeIn, PNG_CONST double file_gammaIn, PNG_CONST double screen_gammaIn, PNG_CONST png_byte sbitIn, PNG_CONST int threshold_testIn, PNG_CONST char *name, PNG_CONST int speedIn, - PNG_CONST int use_input_precisionIn, PNG_CONST int strip16In) + PNG_CONST int use_input_precisionIn, PNG_CONST int strip16In, + PNG_CONST int expand16In, PNG_CONST int do_backgroundIn, + PNG_CONST png_color_16 *bkgd_colorIn, double bkgd_gammaIn) { gamma_display d; context(&pmIn->this, fault); gamma_display_init(&d, pmIn, FILEID(colour_typeIn, bit_depthIn, interlace_typeIn, 0, 0, 0), file_gammaIn, screen_gammaIn, sbitIn, - threshold_testIn, speedIn, use_input_precisionIn, strip16In); + threshold_testIn, speedIn, use_input_precisionIn, strip16In, + expand16In, do_backgroundIn, bkgd_colorIn, bkgd_gammaIn); Try { png_structp pp; @@ -5609,19 +6295,8 @@ /* Get a png_struct for writing the image. */ pp = set_modifier_for_read(d.pm, &pi, d.this.id, name); - /* Set up gamma processing. */ -#ifdef PNG_FLOATING_POINT_SUPPORTED - png_set_gamma(pp, d.screen_gamma, d.file_gamma); -#else - { - png_fixed_point s = floor(d.screen_gamma*100000+.5); - png_fixed_point f = floor(d.file_gamma*100000+.5); - png_set_gamma_fixed(pp, s, f); - } -#endif - /* Introduce the correct read function. */ if (d.pm->this.progressive) { /* Share the row function with the standard implementation. */ @@ -5650,9 +6325,9 @@ modifier_reset(d.pm); if (d.pm->log && !d.threshold_test && !d.speed) fprintf(stderr, "%d bit %s %s: max error %f (%.2g, %2g%%)\n", - d.this.bit_depth, colour_types[d.this.colour_type], d.name, + d.this.bit_depth, colour_types[d.this.colour_type], name, d.maxerrout, d.maxerrabs, 100*d.maxerrpc); /* Log the summary values too. */ if (d.this.colour_type == 0 || d.this.colour_type == 4) @@ -5731,9 +6406,10 @@ pos = safecatd(name, sizeof name, pos, screen_gamma, 3); (void)gamma_test(pm, colour_type, bit_depth, interlace_type, file_gamma, screen_gamma, bit_depth, 1, name, 0 /*speed*/, 0 /*no input precision*/, - 0 /*no strip16*/); + 0 /*no strip16*/, 0 /*no expand16*/, 0 /*no background*/, 0 /*hence*/, + 0 /*no background gamma*/); } static void perform_gamma_threshold_tests(png_modifier *pm) @@ -5789,9 +6465,10 @@ pos = safecat(name, sizeof name, pos, "->"); pos = safecatd(name, sizeof name, pos, screen_gamma, 3); gamma_test(pm, colour_type, bit_depth, interlace_type, file_gamma, - screen_gamma, sbit, 0, name, speed, use_input_precision, strip16); + screen_gamma, sbit, 0, name, speed, use_input_precision, strip16, + pm->test_gamma_expand16, 0 , 0, 0); } static void perform_gamma_transform_tests(png_modifier *pm, int speed) { @@ -5929,8 +6606,188 @@ } } #endif /* 16 to 8 bit conversion */ +#if defined PNG_READ_BACKGROUND_SUPPORTED || defined PNG_READ_ALPHA_MODE_SUPPORTED +static void gamma_composition_test(png_modifier *pm, + PNG_CONST png_byte colour_type, PNG_CONST png_byte bit_depth, + PNG_CONST int interlace_type, PNG_CONST double file_gamma, + PNG_CONST double screen_gamma, PNG_CONST int speed, + PNG_CONST int use_input_precision, PNG_CONST int do_background, + PNG_CONST int expand_16) +{ + size_t pos = 0; + png_const_charp base; + double bg; + char name[128]; + png_color_16 background; + + /* Make up a name and get an appropriate background gamma value. */ + switch (do_background) + { + default: + base = "gamma "; + bg = 4; /* should not be used */ + break; + case PNG_BACKGROUND_GAMMA_SCREEN: + base = "background(screen) "; + bg = 1/screen_gamma; + break; + case PNG_BACKGROUND_GAMMA_FILE: + base = "background(file) "; + bg = file_gamma; + break; + case PNG_BACKGROUND_GAMMA_UNIQUE: + base = "background(unique) "; + /* This tests the handling of a unique value, the math is such that the + * value tends to be <1, but is neither screen nor file (even if they + * match!) + */ + bg = (file_gamma + screen_gamma) / 3; + break; +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED + case ALPHA_MODE_OFFSET + PNG_ALPHA_PNG: + base = "alpha mode(PNG) "; + bg = 4; /* should not be used */ + break; + case ALPHA_MODE_OFFSET + PNG_ALPHA_STANDARD: + base = "alpha mode(Porter-Duff) "; + bg = 4; /* should not be used */ + break; + case ALPHA_MODE_OFFSET + PNG_ALPHA_OPTIMIZED: + base = "alpha mode(Optimized) "; + bg = 4; /* should not be used */ + break; + case ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN: + base = "alpha mode(Broken) "; + bg = 4; /* should not be used */ + break; +#endif + } + + /* Use random background values - the background is always presented in the + * output space (8 or 16 bit components). + */ + if (expand_16 || bit_depth == 16) + { + png_uint_32 r = random_32(); + + background.red = (png_uint_16)r; + background.green = (png_uint_16)(r >> 16); + r = random_32(); + background.blue = (png_uint_16)r; + background.gray = (png_uint_16)(r >> 16); + } + + else /* 8 bit colors */ + { + png_uint_32 r = random_32(); + + background.red = (png_byte)r; + background.green = (png_byte)(r >> 8); + background.blue = (png_byte)(r >> 16); + background.gray = (png_byte)(r >> 24); + } + + background.index = 193; /* rgb(193,193,193) to detect errors */ + if (!(colour_type & PNG_COLOR_MASK_COLOR)) + { + /* Grayscale input, we do not convert to RGB (TBD), so we must set the + * background to gray - else libpng seems to fail. + */ + background.red = background.green = background.blue = background.gray; + } + + pos = safecat(name, sizeof name, pos, base); + pos = safecatd(name, sizeof name, pos, file_gamma, 3); + if (do_background < ALPHA_MODE_OFFSET) + { + /* Include the background color and gamma in the name: */ + pos = safecat(name, sizeof name, pos, ",("); + /* This assumes no expand gray->rgb - the current code won't handle that! + */ + if (colour_type & PNG_COLOR_MASK_COLOR) + { + pos = safecatn(name, sizeof name, pos, background.red); + pos = safecat(name, sizeof name, pos, ","); + pos = safecat(name, sizeof name, pos, ","); + pos = safecatn(name, sizeof name, pos, background.blue); + } + else + pos = safecatn(name, sizeof name, pos, background.gray); + pos = safecat(name, sizeof name, pos, ")^"); + pos = safecatd(name, sizeof name, pos, bg, 3); + } + pos = safecat(name, sizeof name, pos, "->"); + pos = safecatd(name, sizeof name, pos, screen_gamma, 3); + + gamma_test(pm, colour_type, bit_depth, interlace_type, file_gamma, + screen_gamma, bit_depth, 0, name, speed, use_input_precision, + 0/*strip 16*/, expand_16, do_background, &background, bg); +} + + +static void +perform_gamma_composition_tests(png_modifier *pm, int speed, int do_background, + int expand_16) +{ + png_byte colour_type = 0; + png_byte bit_depth = 0; + + /* This should test palette images, but the code isn't here to do it, also + * skip the non-alpha cases - no tRNS chunk is interpolated. + */ + while (next_format(&colour_type, &bit_depth)) + if ((colour_type != 3 && (colour_type & PNG_COLOR_MASK_ALPHA) != 0)) + { + unsigned int i, j; + + /* Don't skip the i==j case here - it's relevant. */ + for (i=0; ingammas; ++i) for (j=0; jngammas; ++j) + { + /* use_input_precision must currently be false here because the checks + * in gamma_component_validate switched on by use_input_precision do + * *not* handle the composition being tested here. + */ + gamma_composition_test(pm, colour_type, bit_depth, pm->interlace_type, + 1/pm->gammas[i], pm->gammas[j], speed, 0/*use_input_precision*/, + do_background, expand_16); + + if (fail(pm)) + return; + } + } +} +#endif /* READ_BACKGROUND || READ_ALPHA_MODE */ + +static void +init_gamma_errors(png_modifier *pm) +{ + pm->error_gray_2 = pm->error_gray_4 = pm->error_gray_8 = pm->error_color_8 = + 0; + pm->error_gray_16 = pm->error_color_16 = 0; +} + +static void +summarize_gamma_errors(png_modifier *pm, png_const_charp who, int low_bit_depth) +{ + if (who) + printf("Gamma correction with %s:\n", who); + + if (low_bit_depth) + { + printf(" 2 bit gray: %.5f\n", pm->error_gray_2); + printf(" 4 bit gray: %.5f\n", pm->error_gray_4); + printf(" 8 bit gray: %.5f\n", pm->error_gray_8); + printf(" 8 bit color: %.5f\n", pm->error_color_8); + } + +#ifdef DO_16BIT + printf(" 16 bit gray: %.5f\n", pm->error_gray_16); + printf(" 16 bit color: %.5f\n", pm->error_color_16); +#endif +} + static void perform_gamma_test(png_modifier *pm, int speed, int summary) { /* First some arbitrary no-transform tests: */ @@ -5944,8 +6801,9 @@ /* Now some real transforms. */ if (pm->test_gamma_transform) { + init_gamma_errors(pm); perform_gamma_transform_tests(pm, speed); if (summary) { @@ -5961,51 +6819,27 @@ printf("number (typically less than 5) for the 16 bit formats.\n"); printf("For performance reasons the value for 16 bit formats\n"); printf("increases when the image file includes an sBIT chunk.\n\n"); - printf(" 2 bit gray: %.5f\n", pm->error_gray_2); - printf(" 4 bit gray: %.5f\n", pm->error_gray_4); - printf(" 8 bit gray: %.5f\n", pm->error_gray_8); - printf(" 8 bit color: %.5f\n", pm->error_color_8); -#ifdef DO_16BIT - printf(" 16 bit gray: %.5f\n", pm->error_gray_16); - printf(" 16 bit color: %.5f\n", pm->error_color_16); -#endif + summarize_gamma_errors(pm, 0/*who*/, 1); } } /* The sbit tests produce much larger errors: */ if (pm->test_gamma_sbit) { - pm->error_gray_2 = pm->error_gray_4 = pm->error_gray_8 = - pm->error_gray_16 = pm->error_color_8 = pm->error_color_16 = 0; + init_gamma_errors(pm); perform_gamma_sbit_tests(pm, speed); if (summary) - { - printf("Gamma correction with sBIT:\n"); - - if (pm->sbitlow < 8U) - { - printf(" 2 bit gray: %.5f\n", pm->error_gray_2); - printf(" 4 bit gray: %.5f\n", pm->error_gray_4); - printf(" 8 bit gray: %.5f\n", pm->error_gray_8); - printf(" 8 bit color: %.5f\n", pm->error_color_8); - } - - #ifdef DO_16BIT - printf(" 16 bit gray: %.5f\n", pm->error_gray_16); - printf(" 16 bit color: %.5f\n", pm->error_color_16); - #endif - } + summarize_gamma_errors(pm, "sBIT", pm->sbitlow < 8U); } #ifdef PNG_READ_16_TO_8_SUPPORTED if (pm->test_gamma_strip16) { /* The 16 to 8 bit strip operations: */ - pm->error_gray_2 = pm->error_gray_4 = pm->error_gray_8 = - pm->error_gray_16 = pm->error_color_8 = pm->error_color_16 = 0; + init_gamma_errors(pm); perform_gamma_strip16_tests(pm, speed); if (summary) { @@ -6014,9 +6848,41 @@ printf(" 16 bit color: %.5f\n", pm->error_color_16); } } #endif + +#ifdef PNG_READ_BACKGROUND_SUPPORTED + if (pm->test_gamma_background) + { + init_gamma_errors(pm); + + perform_gamma_composition_tests(pm, speed, PNG_BACKGROUND_GAMMA_UNIQUE, + pm->test_gamma_expand16); + + if (summary) + summarize_gamma_errors(pm, "background", 1); + } +#endif + +#ifdef PNG_READ_ALPHA_MODE_SUPPORTED + if (pm->test_gamma_alpha_mode) + { + int do_background; + + init_gamma_errors(pm); + + for (do_background = ALPHA_MODE_OFFSET + PNG_ALPHA_STANDARD; + do_background <= ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN && !fail(pm); + ++do_background) + perform_gamma_composition_tests(pm, speed, do_background, + pm->test_gamma_expand16); + + if (summary) + summarize_gamma_errors(pm, "alpha mode", 1); + } +#endif } +#endif /* PNG_READ_GAMMA_SUPPORTED */ /* INTERLACE MACRO VALIDATION */ /* This is copied verbatim from the specification, it is simply the pass * number in which each pixel in each 8x8 tile appears. The array must @@ -6415,11 +7281,13 @@ * images can never be good enough, regardless of encoding. */ pm.maxout8 = .1; /* Arithmetic error in *encoded* value */ pm.maxabs8 = .00005; /* 1/20000 */ + pm.maxcalc8 = .004; /* 1/250: +/-1 in 8 bits for compose errors */ pm.maxpc8 = .499; /* I.e., .499% fractional error */ pm.maxout16 = .499; /* Error in *encoded* value */ pm.maxabs16 = .00005;/* 1/20000 */ + pm.maxcalc16 =.00005;/* 1/20000: for compose errors */ /* NOTE: this is a reasonable perceptual limit. We assume that humans can * perceive light level differences of 1% over a 100:1 range, so we need to * maintain 1 in 10000 accuracy (in linear light space), which is what the @@ -6466,8 +7334,9 @@ else if (strcmp(*argv, "--notransform") == 0) pm.test_transform = 0; +#ifdef PNG_READ_TRANSFORMS_SUPPORTED else if (strncmp(*argv, "--transform-disable=", sizeof "--transform-disable") == 0) { pm.test_transform = 1; @@ -6479,8 +7348,9 @@ { pm.test_transform = 1; transform_enable(*argv + sizeof "--transform-enable"); } +#endif /* PNG_READ_TRANSFORMS_SUPPORTED */ else if (strcmp(*argv, "--gamma") == 0) { /* Just do two gamma tests here (2.2 and linear) for speed: */ @@ -6488,8 +7358,10 @@ pm.test_gamma_threshold = 1; pm.test_gamma_transform = 1; pm.test_gamma_sbit = 1; pm.test_gamma_strip16 = 1; + pm.test_gamma_background = 1; + pm.test_gamma_alpha_mode = 1; } else if (strcmp(*argv, "--nogamma") == 0) pm.ngammas = 0; @@ -6517,8 +7389,29 @@ else if (strcmp(*argv, "--nogamma-16-to-8") == 0) pm.test_gamma_strip16 = 0; + else if (strcmp(*argv, "--gamma-background") == 0) + pm.ngammas = 2U, pm.test_gamma_background = 1; + + else if (strcmp(*argv, "--nogamma-background") == 0) + pm.test_gamma_background = 0; + + else if (strcmp(*argv, "--gamma-alpha-mode") == 0) + pm.ngammas = 2U, pm.test_gamma_alpha_mode = 1; + + else if (strcmp(*argv, "--nogamma-alpha-mode") == 0) + pm.test_gamma_alpha_mode = 0; + + else if (strcmp(*argv, "--expand16") == 0) + pm.test_gamma_expand16 = 1; + + else if (strcmp(*argv, "--noexpand16") == 0) + pm.test_gamma_expand16 = 0; + + else if (strcmp(*argv, "--more-gammas") == 0) + pm.ngammas = 3U; + else if (strcmp(*argv, "--all-gammas") == 0) pm.ngammas = (sizeof gammas)/(sizeof gammas[0]); else if (strcmp(*argv, "--progressive-read") == 0) @@ -6526,34 +7419,46 @@ else if (strcmp(*argv, "--interlace") == 0) pm.interlace_type = PNG_INTERLACE_ADAM7; + else if (strcmp(*argv, "--use-input-precision") == 0) + pm.use_input_precision = 1; + + else if (strcmp(*argv, "--use-linear-precision") == 0) + pm.use_linear_precision = 1; + else if (argc >= 1 && strcmp(*argv, "--sbitlow") == 0) --argc, pm.sbitlow = (png_byte)atoi(*++argv); else if (argc >= 1 && strcmp(*argv, "--touch") == 0) --argc, touch = *++argv; - else if (argc >= 1 && strncmp(*argv, "--max", 4) == 0) + else if (argc >= 1 && strncmp(*argv, "--max", 5) == 0) { --argc; - if (strcmp(4+*argv, "abs8") == 0) + if (strcmp(5+*argv, "abs8") == 0) pm.maxabs8 = atof(*++argv); - else if (strcmp(4+*argv, "abs16") == 0) + else if (strcmp(5+*argv, "abs16") == 0) pm.maxabs16 = atof(*++argv); - else if (strcmp(4+*argv, "out8") == 0) + else if (strcmp(5+*argv, "calc8") == 0) + pm.maxcalc8 = atof(*++argv); + + else if (strcmp(5+*argv, "calc16") == 0) + pm.maxcalc16 = atof(*++argv); + + else if (strcmp(5+*argv, "out8") == 0) pm.maxout8 = atof(*++argv); - else if (strcmp(4+*argv, "out16") == 0) + else if (strcmp(5+*argv, "out16") == 0) pm.maxout16 = atof(*++argv); - else if (strcmp(4+*argv, "pc8") == 0) + else if (strcmp(5+*argv, "pc8") == 0) pm.maxpc8 = atof(*++argv); - else if (strcmp(4+*argv, "pc16") == 0) + else if (strcmp(5+*argv, "pc16") == 0) pm.maxpc16 = atof(*++argv); else { @@ -6574,22 +7479,33 @@ */ if (pm.test_standard == 0 && pm.test_size == 0 && pm.test_transform == 0 && pm.ngammas == 0) { + /* Make this do all the tests done in the test shell scripts with the same + * parameters, where possible. The limitation is that all the progressive + * read and interlace stuff has to be done in separate runs, so only the + * basic 'standard' and 'size' tests are done. + */ pm.test_standard = 1; pm.test_size = 1; pm.test_transform = 1; - pm.ngammas = 3U; + pm.ngammas = 2U; } if (pm.ngammas > 0 && pm.test_gamma_threshold == 0 && pm.test_gamma_transform == 0 && - pm.test_gamma_sbit == 0 && pm.test_gamma_strip16 == 0) + pm.test_gamma_sbit == 0 && pm.test_gamma_strip16 == 0 && + pm.test_gamma_background == 0 && pm.test_gamma_alpha_mode == 0) { pm.test_gamma_threshold = 1; pm.test_gamma_transform = 1; pm.test_gamma_sbit = 1; pm.test_gamma_strip16 = 1; + pm.test_gamma_background = 1; + pm.test_gamma_alpha_mode = 1; + /* For the moment the inaccuarcy of the libpng composition requires this: + */ + pm.use_linear_precision = 1; } else if (pm.ngammas == 0) { @@ -6597,8 +7513,10 @@ pm.test_gamma_threshold = 0; pm.test_gamma_transform = 0; pm.test_gamma_sbit = 0; pm.test_gamma_strip16 = 0; + pm.test_gamma_background = 0; + pm.test_gamma_alpha_mode = 0; } Try { @@ -6608,8 +7526,9 @@ /* Perform the standard and gamma tests. */ if (pm.test_standard) { perform_interlace_macro_validation(); + perform_formatting_test(&pm.this); perform_standard_test(&pm); perform_error_test(&pm); } @@ -6619,15 +7538,19 @@ make_size_images(&pm.this); perform_size_test(&pm); } +#ifdef PNG_READ_TRANSFORMS_SUPPORTED /* Combinatorial transforms: */ if (pm.test_transform) perform_transform_test(&pm); +#endif /* PNG_READ_TRANSFORMS_SUPPORTED */ +#ifdef PNG_READ_GAMMA_SUPPORTED if (pm.ngammas > 0) perform_gamma_test(&pm, pm.this.speed != 0, summary && !pm.this.speed); +#endif } Catch(fault) { diff -ru4NwbB libpng-1.5.2/pngwrite.c libpng-1.5.3beta06/pngwrite.c --- libpng-1.5.2/pngwrite.c 2011-03-31 11:23:40.832722141 -0500 +++ libpng-1.5.3beta06/pngwrite.c 2011-05-07 21:41:07.030834812 -0500 @@ -1,8 +1,8 @@ /* pngwrite.c - general routines to write a PNG file * - * Last changed in libpng 1.5.1 [February 3, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -461,12 +461,11 @@ #endif png_structp png_ptr; #ifdef PNG_SETJMP_SUPPORTED #ifdef USE_FAR_KEYWORD - jmp_buf png_jmpbuf; + jmp_buf tmp_jmpbuf; #endif #endif - int i; png_debug(1, "in png_create_write_struct"); #ifdef PNG_USER_MEM_SUPPORTED @@ -488,14 +487,14 @@ /* Applications that neglect to set up their own setjmp() and then encounter a png_error() will longjmp here. Since the jmpbuf is then meaningless we abort instead of returning. */ #ifdef USE_FAR_KEYWORD - if (setjmp(png_jmpbuf)) + if (setjmp(tmp_jmpbuf)) #else if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */ #endif #ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(png_ptr), png_jmpbuf, png_sizeof(jmp_buf)); + png_memcpy(png_jmpbuf(png_ptr), tmp_jmpbuf, png_sizeof(jmp_buf)); #endif PNG_ABORT(); #endif @@ -503,51 +502,10 @@ png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); #endif /* PNG_USER_MEM_SUPPORTED */ png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); - if (user_png_ver) - { - i = 0; - do - { - if (user_png_ver[i] != png_libpng_ver[i]) - png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; - } while (png_libpng_ver[i++]); - } - - if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) - { - /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so - * we must recompile any applications that use any older library version. - * For versions after libpng 1.0, we will be compatible, so we need - * only check the first digit. - */ - if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || - (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || - (user_png_ver[0] == '0' && user_png_ver[2] < '9')) - { -#ifdef PNG_CONSOLE_IO_SUPPORTED - char msg[80]; - - if (user_png_ver) - { - png_snprintf2(msg, 80, - "Application built with libpng-%.20s" - " but running with %.20s", - user_png_ver, - png_libpng_ver); - png_warning(png_ptr, msg); - } -#else - png_warning(png_ptr, - "Incompatible libpng version in application and library"); -#endif -#ifdef PNG_ERROR_NUMBERS_SUPPORTED - png_ptr->flags = 0; -#endif + if (!png_user_version_check(png_ptr, user_png_ver)) png_cleanup_needed = 1; - } - } /* Initialize zbuf - compression buffer */ png_ptr->zbuf_size = PNG_ZBUF_SIZE; @@ -804,11 +762,13 @@ } } #endif +#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED /* Handle other transformations */ if (png_ptr->transformations) png_do_write_transformations(png_ptr); +#endif #ifdef PNG_MNG_FEATURES_SUPPORTED /* Write filter_method 64 (intrapixel differencing) only if * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and @@ -883,10 +843,8 @@ if (!(png_ptr->zstream.avail_out)) { /* Write the IDAT and reset the zlib output buffer */ png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; wrote_IDAT = 1; } } while (wrote_IDAT == 1); @@ -895,10 +853,8 @@ { /* Write the IDAT and reset the zlib output buffer */ png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size - png_ptr->zstream.avail_out); - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; } png_ptr->flush_rows = 0; png_flush(png_ptr); } @@ -982,17 +938,20 @@ #ifdef PNG_SETJMP_SUPPORTED jmp_buf tmp_jmp; /* Save jump buffer */ #endif png_error_ptr error_fn; +#ifdef PNG_WARNINGS_SUPPORTED png_error_ptr warning_fn; +#endif png_voidp error_ptr; #ifdef PNG_USER_MEM_SUPPORTED png_free_ptr free_fn; #endif png_debug(1, "in png_write_destroy"); /* Free any memory zlib uses */ + if (png_ptr->zlib_state != PNG_ZLIB_UNINITIALIZED) deflateEnd(&png_ptr->zstream); /* Free our memory. png_free checks NULL for us. */ png_free(png_ptr, png_ptr->zbuf); @@ -1004,12 +963,8 @@ png_free(png_ptr, png_ptr->avg_row); png_free(png_ptr, png_ptr->paeth_row); #endif -#ifdef PNG_TIME_RFC1123_SUPPORTED - png_free(png_ptr, png_ptr->time_buffer); -#endif - #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* Use this to save a little code space, it doesn't free the filter_costs */ png_reset_filter_heuristics(png_ptr); png_free(png_ptr, png_ptr->filter_costs); @@ -1017,29 +972,33 @@ #endif #ifdef PNG_SETJMP_SUPPORTED /* Reset structure */ - png_memcpy(tmp_jmp, png_ptr->png_jmpbuf, png_sizeof(jmp_buf)); + png_memcpy(tmp_jmp, png_ptr->longjmp_buffer, png_sizeof(jmp_buf)); #endif error_fn = png_ptr->error_fn; +#ifdef PNG_WARNINGS_SUPPORTED warning_fn = png_ptr->warning_fn; +#endif error_ptr = png_ptr->error_ptr; #ifdef PNG_USER_MEM_SUPPORTED free_fn = png_ptr->free_fn; #endif png_memset(png_ptr, 0, png_sizeof(png_struct)); png_ptr->error_fn = error_fn; +#ifdef PNG_WARNINGS_SUPPORTED png_ptr->warning_fn = warning_fn; +#endif png_ptr->error_ptr = error_ptr; #ifdef PNG_USER_MEM_SUPPORTED png_ptr->free_fn = free_fn; #endif #ifdef PNG_SETJMP_SUPPORTED - png_memcpy(png_ptr->png_jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); + png_memcpy(png_ptr->longjmp_buffer, tmp_jmp, png_sizeof(jmp_buf)); #endif } /* Allow the application to select one or more row filters to use. */ @@ -1450,8 +1409,11 @@ png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY; png_ptr->zlib_strategy = strategy; } +/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a + * smaller value of window_bits if it can do so safely. + */ void PNGAPI png_set_compression_window_bits(png_structp png_ptr, int window_bits) { if (png_ptr == NULL) @@ -1490,8 +1452,91 @@ png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD; png_ptr->zlib_method = method; } +/* The following were added to libpng-1.5.3 */ +#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION +void PNGAPI +png_set_text_compression_level(png_structp png_ptr, int level) +{ + png_debug(1, "in png_set_text_compression_level"); + + if (png_ptr == NULL) + return; + + png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_LEVEL; + png_ptr->zlib_text_level = level; +} + +void PNGAPI +png_set_text_compression_mem_level(png_structp png_ptr, int mem_level) +{ + png_debug(1, "in png_set_text_compression_mem_level"); + + if (png_ptr == NULL) + return; + + png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL; + png_ptr->zlib_text_mem_level = mem_level; +} + +void PNGAPI +png_set_text_compression_strategy(png_structp png_ptr, int strategy) +{ + png_debug(1, "in png_set_text_compression_strategy"); + + if (png_ptr == NULL) + return; + + png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_STRATEGY; + png_ptr->zlib_text_strategy = strategy; +} + +/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a + * smaller value of window_bits if it can do so safely. + */ +void PNGAPI +png_set_text_compression_window_bits(png_structp png_ptr, int window_bits) +{ + if (png_ptr == NULL) + return; + + if (window_bits > 15) + png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); + + else if (window_bits < 8) + png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); + +#ifndef WBITS_8_OK + /* Avoid libpng bug with 256-byte windows */ + if (window_bits == 8) + { + png_warning(png_ptr, "Text compression window is being reset to 512"); + window_bits = 9; + } + +#endif + png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS; + png_ptr->zlib_text_window_bits = window_bits; +} + +void PNGAPI +png_set_text_compression_method(png_structp png_ptr, int method) +{ + png_debug(1, "in png_set_text_compression_method"); + + if (png_ptr == NULL) + return; + + if (method != 8) + png_warning(png_ptr, "Only compression method 8 is supported by PNG"); + + png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_METHOD; + png_ptr->zlib_text_method = method; +} +#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION */ +/* end of API added to libpng-1.5.3 */ + void PNGAPI png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn) { if (png_ptr == NULL) @@ -1556,9 +1601,9 @@ png_set_swap_alpha(png_ptr); #endif #ifdef PNG_WRITE_FILLER_SUPPORTED - /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */ + /* Pack XRGB/RGBX/ARGB/RGBA into RGB (4 channels -> 3 channels) */ if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER) png_set_filler(png_ptr, 0, PNG_FILLER_AFTER); else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) diff -ru4NwbB libpng-1.5.2/pngwtran.c libpng-1.5.3beta06/pngwtran.c --- libpng-1.5.2/pngwtran.c 2011-03-31 11:23:40.839135854 -0500 +++ libpng-1.5.3beta06/pngwtran.c 2011-05-07 21:41:07.037455113 -0500 @@ -1,8 +1,8 @@ /* pngwtran.c - transforms the data in a row for PNG writers * - * Last changed in libpng 1.5.2 [March 31, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -14,8 +14,9 @@ #include "pngpriv.h" #ifdef PNG_WRITE_SUPPORTED +#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED /* Transform the data according to the user's wishes. The order of * transformations is significant. */ void /* PRIVATE */ @@ -44,9 +45,9 @@ #ifdef PNG_WRITE_FILLER_SUPPORTED if (png_ptr->transformations & PNG_FILLER) png_do_strip_channel(&(png_ptr->row_info), png_ptr->row_buf + 1, - !(png_ptr->flags & PNG_FILLER_AFTER)); + !(png_ptr->flags & PNG_FLAG_FILLER_AFTER)); #endif #ifdef PNG_WRITE_PACKSWAP_SUPPORTED if (png_ptr->transformations & PNG_PACKSWAP) @@ -562,8 +563,9 @@ } } } #endif +#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */ #ifdef PNG_MNG_FEATURES_SUPPORTED /* Undoes intrapixel differencing */ void /* PRIVATE */ diff -ru4NwbB libpng-1.5.2/pngwutil.c libpng-1.5.3beta06/pngwutil.c --- libpng-1.5.2/pngwutil.c 2011-03-31 11:23:40.850911793 -0500 +++ libpng-1.5.3beta06/pngwutil.c 2011-05-07 21:41:07.049883667 -0500 @@ -1,8 +1,8 @@ /* pngwutil.c - utilities to write a PNG file * - * Last changed in libpng 1.5.0 [January 6, 2011] + * Last changed in libpng 1.5.3 [(PENDING RELEASE)] * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -191,9 +191,151 @@ png_write_data(png_ptr, buf, (png_size_t)4); } -#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED) +/* Initialize the compressor for the appropriate type of compression. */ +static void +png_zlib_claim(png_structp png_ptr, png_uint_32 state) +{ + if (!(png_ptr->zlib_state & PNG_ZLIB_IN_USE)) + { + /* If already initialized for 'state' do not re-init. */ + if (png_ptr->zlib_state != state) + { + int ret = Z_OK; + png_const_charp who = "-"; + + /* If actually initialized for another state do a deflateEnd. */ + if (png_ptr->zlib_state != PNG_ZLIB_UNINITIALIZED) + { + ret = deflateEnd(&png_ptr->zstream); + who = "end"; + png_ptr->zlib_state = PNG_ZLIB_UNINITIALIZED; + } + + /* zlib itself detects an incomplete state on deflateEnd */ + if (ret == Z_OK) switch (state) + { +# ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED + case PNG_ZLIB_FOR_TEXT: + ret = deflateInit2(&png_ptr->zstream, + png_ptr->zlib_text_level, png_ptr->zlib_text_method, + png_ptr->zlib_text_window_bits, + png_ptr->zlib_text_mem_level, png_ptr->zlib_text_strategy); + who = "text"; + break; +# endif + + case PNG_ZLIB_FOR_IDAT: + ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level, + png_ptr->zlib_method, png_ptr->zlib_window_bits, + png_ptr->zlib_mem_level, png_ptr->zlib_strategy); + who = "IDAT"; + break; + + default: + png_error(png_ptr, "invalid zlib state"); + } + + if (ret == Z_OK) + png_ptr->zlib_state = state; + + else /* an error in deflateEnd or deflateInit2 */ + { + size_t pos = 0; + char msg[64]; + + pos = png_safecat(msg, sizeof msg, pos, + "zlib failed to initialize compressor ("); + pos = png_safecat(msg, sizeof msg, pos, who); + + switch (ret) + { + case Z_VERSION_ERROR: + pos = png_safecat(msg, sizeof msg, pos, ") version error"); + break; + + case Z_STREAM_ERROR: + pos = png_safecat(msg, sizeof msg, pos, ") stream error"); + break; + + case Z_MEM_ERROR: + pos = png_safecat(msg, sizeof msg, pos, ") memory error"); + break; + + default: + pos = png_safecat(msg, sizeof msg, pos, ") unknown error"); + break; + } + + png_error(png_ptr, msg); + } + } + + /* Here on success, claim the zstream: */ + png_ptr->zlib_state |= PNG_ZLIB_IN_USE; + } + + else + png_error(png_ptr, "zstream already in use (internal error)"); +} + +/* The opposite: release the stream. It is also reset, this API will warn on + * error but will not fail. + */ +static void +png_zlib_release(png_structp png_ptr) +{ + if (png_ptr->zlib_state & PNG_ZLIB_IN_USE) + { + int ret = deflateReset(&png_ptr->zstream); + + png_ptr->zlib_state &= ~PNG_ZLIB_IN_USE; + + if (ret != Z_OK) + { + png_const_charp err; + PNG_WARNING_PARAMETERS(p) + + switch (ret) + { + case Z_VERSION_ERROR: + err = "version"; + break; + + case Z_STREAM_ERROR: + err = "stream"; + break; + + case Z_MEM_ERROR: + err = "memory"; + break; + + default: + err = "unknown"; + break; + } + + png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_d, ret); + png_warning_parameter(p, 2, err); + + if (png_ptr->zstream.msg) + err = png_ptr->zstream.msg; + else + err = "[no zlib message]"; + + png_warning_parameter(p, 3, err); + + png_formatted_warning(png_ptr, p, + "zlib failed to reset compressor: @1(@2): @3"); + } + } + + else + png_warning(png_ptr, "zstream not in use (internal error)"); +} + +#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED /* This pair of functions encapsulates the operation of (a) compressing a * text string, and (b) issuing it later as a series of chunk data writes. * The compression_state structure is shared context for these functions * set up by the caller in order to make the whole mess thread-safe. @@ -219,27 +361,24 @@ comp->num_output_ptr = 0; comp->max_output_ptr = 0; comp->output_ptr = NULL; comp->input = NULL; - comp->input_len = 0; + comp->input_len = text_len; /* We may just want to pass the text right through */ if (compression == PNG_TEXT_COMPRESSION_NONE) { comp->input = (png_const_bytep)text; - comp->input_len = text_len; return((int)text_len); } if (compression >= PNG_TEXT_COMPRESSION_LAST) { -#ifdef PNG_CONSOLE_IO_SUPPORTED - char msg[50]; - png_snprintf(msg, 50, "Unknown compression type %d", compression); - png_warning(png_ptr, msg); -#else - png_warning(png_ptr, "Unknown compression type"); -#endif + PNG_WARNING_PARAMETERS(p) + + png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_d, + compression); + png_formatted_warning(png_ptr, p, "Unknown compression type @1"); } /* We can't write the chunk until we find out how much data we have, * which means we need to run the compressor first and save the @@ -254,8 +393,9 @@ * if we can't malloc more than 64K and we have 64K of random input * data, or if the input string is incredibly large (although this * wouldn't cause a failure, just a slowdown due to swapping). */ + png_zlib_claim(png_ptr, PNG_ZLIB_FOR_TEXT); /* Set up the compression buffers */ /* TODO: the following cast hides a potential overflow problem. */ png_ptr->zstream.avail_in = (uInt)text_len; @@ -417,8 +558,70 @@ return; } +#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED + if (comp->input_len >= 2 && comp->input_len < 16384) + { + unsigned int z_cmf; /* zlib compression method and flags */ + + /* Optimize the CMF field in the zlib stream. This hack of the zlib + * stream is compliant to the stream specification. + */ + + if (comp->num_output_ptr) + z_cmf = comp->output_ptr[0][0]; + else + z_cmf = png_ptr->zbuf[0]; + + if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) + { + unsigned int z_cinfo; + unsigned int half_z_window_size; + png_size_t uncompressed_text_size = comp->input_len; + + z_cinfo = z_cmf >> 4; + half_z_window_size = 1 << (z_cinfo + 7); + + while (uncompressed_text_size <= half_z_window_size && + half_z_window_size >= 256) + { + z_cinfo--; + half_z_window_size >>= 1; + } + + z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4); + + if (comp->num_output_ptr) + { + + if (comp->output_ptr[0][0] != z_cmf) + { + int tmp; + + comp->output_ptr[0][0] = (png_byte)z_cmf; + tmp = comp->output_ptr[0][1] & 0xe0; + tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; + comp->output_ptr[0][1] = (png_byte)tmp; + } + } + else + { + int tmp; + + png_ptr->zbuf[0] = (png_byte)z_cmf; + tmp = png_ptr->zbuf[1] & 0xe0; + tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; + png_ptr->zbuf[1] = (png_byte)tmp; + } + } + + else + png_error(png_ptr, + "Invalid zlib compression method or flags in non-IDAT chunk"); + } +#endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */ + /* Write saved output buffers, if any */ for (i = 0; i < comp->num_output_ptr; i++) { png_write_chunk_data(png_ptr, comp->output_ptr[i], @@ -435,12 +638,11 @@ png_write_chunk_data(png_ptr, png_ptr->zbuf, (png_size_t)(png_ptr->zbuf_size - png_ptr->zstream.avail_out)); /* Reset zlib for another zTXt/iTXt or image data */ - deflateReset(&png_ptr->zstream); - png_ptr->zstream.data_type = Z_BINARY; + png_zlib_release(png_ptr); } -#endif +#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */ /* Write the IHDR chunk, and update the png_struct with the necessary * information. Note that the rest of this code depends upon this * information being correct. @@ -450,9 +652,8 @@ int bit_depth, int color_type, int compression_type, int filter_type, int interlace_type) { PNG_IHDR; - int ret; png_byte buf[13]; /* Buffer to store the IHDR info */ png_debug(1, "in png_write_IHDR"); @@ -631,37 +832,37 @@ if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD)) png_ptr->zlib_method = 8; - ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level, - png_ptr->zlib_method, png_ptr->zlib_window_bits, - png_ptr->zlib_mem_level, png_ptr->zlib_strategy); +#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED +#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION + if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_STRATEGY)) + png_ptr->zlib_text_strategy = Z_DEFAULT_STRATEGY; + + if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_LEVEL)) + png_ptr->zlib_text_level = png_ptr->zlib_level; - if (ret != Z_OK) - { - if (ret == Z_VERSION_ERROR) - png_error(png_ptr, - "zlib failed to initialize compressor -- version error"); + if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL)) + png_ptr->zlib_text_mem_level = png_ptr->zlib_mem_level; - if (ret == Z_STREAM_ERROR) - png_error(png_ptr, - "zlib failed to initialize compressor -- stream error"); + if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS)) + png_ptr->zlib_text_window_bits = png_ptr->zlib_window_bits; - if (ret == Z_MEM_ERROR) - png_error(png_ptr, - "zlib failed to initialize compressor -- mem error"); + if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_METHOD)) + png_ptr->zlib_text_method = png_ptr->zlib_method; +#else + png_ptr->zlib_text_strategy = Z_DEFAULT_STRATEGY; + png_ptr->zlib_text_level = png_ptr->zlib_level; + png_ptr->zlib_text_mem_level = png_ptr->zlib_mem_level; + png_ptr->zlib_text_window_bits = png_ptr->zlib_window_bits; + png_ptr->zlib_text_method = png_ptr->zlib_method; +#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION */ +#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */ - png_error(png_ptr, "zlib failed to initialize compressor"); - } + /* Record that the compressor has not yet been initialized. */ + png_ptr->zlib_state = PNG_ZLIB_UNINITIALIZED; - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - /* libpng is not interested in zstream.data_type, so set it - * to a predefined value, to avoid its evaluation inside zlib - */ - png_ptr->zstream.data_type = Z_BINARY; - - png_ptr->mode = PNG_HAVE_IHDR; + png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */ } /* Write the palette. We are careful not to trust png_color to be in the * correct order for PNG, so people can redefine it to any convenient @@ -744,14 +945,17 @@ PNG_IDAT; png_debug(1, "in png_write_IDAT"); - /* Optimize the CMF field in the zlib stream. */ - /* This hack of the zlib stream is compliant to the stream specification. */ +#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED if (!(png_ptr->mode & PNG_HAVE_IDAT) && png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) { + /* Optimize the CMF field in the zlib stream. This hack of the zlib + * stream is compliant to the stream specification. + */ unsigned int z_cmf = data[0]; /* zlib compression method and flags */ + if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) { /* Avoid memory underflows and multiplication overflows. * @@ -760,13 +964,31 @@ */ if (length >= 2 && png_ptr->height < 16384 && png_ptr->width < 16384) { + /* Compute the maximum possible length of the datastream */ + + /* Number of pixels, plus for each row a filter byte and possible + * and possibly a padding byte, so increase the maximum + * size to account for these. + */ + unsigned int z_cinfo; + unsigned int half_z_window_size; png_uint_32 uncompressed_idat_size = png_ptr->height * ((png_ptr->width * png_ptr->channels * png_ptr->bit_depth + 15) >> 3); - unsigned int z_cinfo = z_cmf >> 4; - unsigned int half_z_window_size = 1 << (z_cinfo + 7); + + /* If it's interlaced, each block of 8 rows is sent as up to + * 14 rows, i.e., 6 additional rows, each with a filter byte + * and possibly a padding byte + */ + if (png_ptr->interlaced) + uncompressed_idat_size += ((png_ptr->height + 7)/8) * + (png_ptr->bit_depth < 8 ? 12 : 6); + + z_cinfo = z_cmf >> 4; + half_z_window_size = 1 << (z_cinfo + 7); + while (uncompressed_idat_size <= half_z_window_size && half_z_window_size >= 256) { z_cinfo--; @@ -789,11 +1011,19 @@ else png_error(png_ptr, "Invalid zlib compression method or flags in IDAT"); } +#endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */ png_write_chunk(png_ptr, png_IDAT, data, length); png_ptr->mode |= PNG_HAVE_IDAT; + + /* Prior to 1.5.3 this code was replicated in every caller (except at the + * end, where it isn't technically necessary). Since this function has + * flushed the data we can safely reset the zlib output buffer here. + */ + png_ptr->zstream.next_out = png_ptr->zbuf; + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; } /* Write an IEND chunk */ void /* PRIVATE */ @@ -917,9 +1147,12 @@ png_write_chunk_data(png_ptr, (png_bytep)new_name, (png_size_t)(name_len + 2)); if (profile_len) + { + comp.input_len = profile_len; png_write_compressed_data_out(png_ptr, &comp); + } png_write_chunk_end(png_ptr); png_free(png_ptr, new_name); } @@ -1312,17 +1545,13 @@ { if ((png_byte)*ikp < 0x20 || ((png_byte)*ikp > 0x7E && (png_byte)*ikp < 0xA1)) { -#ifdef PNG_CONSOLE_IO_SUPPORTED - char msg[40]; + PNG_WARNING_PARAMETERS(p) - png_snprintf(msg, 40, - "invalid keyword character 0x%02X", (png_byte)*ikp); - png_warning(png_ptr, msg); -#else - png_warning(png_ptr, "invalid character in keyword"); -#endif + png_warning_parameter_unsigned(p, 1, PNG_NUMBER_FORMAT_02x, + (png_byte)*ikp); + png_formatted_warning(png_ptr, p, "invalid keyword character 0x@1"); *dp = ' '; } else @@ -1498,8 +1727,9 @@ /* Write compression */ png_write_chunk_data(png_ptr, &buf, (png_size_t)1); /* Write the compressed data */ + comp.input_len = text_len; png_write_compressed_data_out(png_ptr, &comp); /* Close the chunk */ png_write_chunk_end(png_ptr); @@ -1870,8 +2100,9 @@ png_ptr->num_rows = png_ptr->height; png_ptr->usr_width = png_ptr->width; } + png_zlib_claim(png_ptr, PNG_ZLIB_FOR_IDAT); png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; png_ptr->zstream.next_out = png_ptr->zbuf; } @@ -1991,9 +2222,9 @@ png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size - png_ptr->zstream.avail_out); } - deflateReset(&png_ptr->zstream); + png_zlib_release(png_ptr); png_ptr->zstream.data_type = Z_BINARY; } #ifdef PNG_WRITE_INTERLACING_SUPPORTED @@ -2180,8 +2411,10 @@ /* This filters the row, chooses which filter to use, if it has not already * been specified by the application, and then writes the row out with the * chosen filter. */ +static void png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row); + #define PNG_MAXSUM (((png_uint_32)(-1)) >> 1) #define PNG_HISHIFT 10 #define PNG_LOMASK ((png_uint_32)0xffffL) #define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT)) @@ -2855,9 +3088,9 @@ } /* Do the actual writing of a previously filtered row. */ -void /* PRIVATE */ +static void png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row) { png_size_t avail; @@ -2915,10 +3148,8 @@ if (!(png_ptr->zstream.avail_out)) { /* Write the IDAT and reset the zlib output buffer */ png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; } /* Repeat until all data has been compressed */ } while (avail > 0 || png_ptr->zstream.avail_in > 0); diff -ru4NwbB libpng-1.5.2/projects/vstudio/zlib.props libpng-1.5.3beta06/projects/vstudio/zlib.props --- libpng-1.5.2/projects/vstudio/zlib.props 2011-03-31 11:23:42.940303614 -0500 +++ libpng-1.5.3beta06/projects/vstudio/zlib.props 2011-05-07 21:41:09.153537921 -0500 @@ -3,9 +3,9 @@ * zlib.props - location of zlib source * * libpng version 1.5.3beta06 - May 8, 2011 * - * Copyright (c) 1998-2010 Glenn Randers-Pehrson + * Copyright (c) 1998-2011 Glenn Randers-Pehrson * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer * and license in png.h @@ -23,8 +23,12 @@ source. If you use a relative directory name (as below) then it must be relative to the project directories; these are one level deepers than the directories containing this file. + If the version of zlib you use does not match that used when the + distribution was built you will get warnings from pngtest that the zlib + versions do not match. The zlib version used in this build is recorded + below: --> - ..\..\..\..\zlib-1.2.4 + ..\..\..\..\zlib-1.2.5 diff -ru4NwbB libpng-1.5.2/scripts/pnglibconf.dfa libpng-1.5.3beta06/scripts/pnglibconf.dfa --- libpng-1.5.2/scripts/pnglibconf.dfa 2011-02-12 09:16:01.541296000 -0600 +++ libpng-1.5.3beta06/scripts/pnglibconf.dfa 2011-05-07 21:41:09.107513722 -0500 @@ -5,9 +5,9 @@ @ */ # com pnglibconf.h - library build configuration com -com libpng version 1.5.0 - January 6, 2011 +com libpng version 1.5.3 - (PENDING RELEASE) com com Copyright (c) 1998-2011 Glenn Randers-Pehrson com com This code is released under the libpng license. @@ -213,11 +213,11 @@ option STDIO option CONSOLE_IO requires STDIO # Note: prior to 1.5.0 this option could not be disabled if STDIO -# was enabled. +# was enabled. Prior to 1.5.3 this option required STDIO -option TIME_RFC1123 requires STDIO +option TIME_RFC1123 # PNG_SETJMP_NOT_SUPPORTED is an old equivalent for NO_SETJMP option SETJMP @@ -310,13 +310,15 @@ option READ_BGR requires READ_TRANSFORMS option READ_SWAP requires READ_TRANSFORMS READ_16BIT option READ_PACKSWAP requires READ_TRANSFORMS option READ_INVERT requires READ_TRANSFORMS -option READ_BACKGROUND requires READ_TRANSFORMS +option READ_BACKGROUND requires READ_TRANSFORMS enables READ_STRIP_ALPHA option READ_16_TO_8 requires READ_TRANSFORMS option READ_FILLER requires READ_TRANSFORMS option READ_GAMMA requires READ_TRANSFORMS enables READ_gAMA option READ_GRAY_TO_RGB requires READ_TRANSFORMS + +option READ_ALPHA_MODE requires READ_TRANSFORMS enables READ_GAMMA option READ_SWAP_ALPHA requires READ_TRANSFORMS option READ_INVERT_ALPHA requires READ_TRANSFORMS option READ_STRIP_ALPHA requires READ_TRANSFORMS option READ_USER_TRANSFORM requires READ_TRANSFORMS @@ -339,8 +341,12 @@ option INCH_CONVERSIONS = INCH_CONVERSIONS INCH_CONVERSIONS +# API to build a grayscale palette + +option BUILD_GRAYSCALE_PALETTE + # IN DEVELOPMENT # These are currently experimental features, define them if you want # Very little testing, not enabled by default. @@ -385,8 +391,13 @@ # apps implementing the user transforms option USER_TRANSFORM_PTR if READ_USER_TRANSFORM WRITE_USER_TRANSFORM option USER_TRANSFORM_INFO if READ_USER_TRANSFORM WRITE_USER_TRANSFORM +# This enables API to set compression parameters for compressing +# non-IDAT chunks (zTXt, iTXt, iCCP, and unknown chunks). This feature +# was added at libpng-1.5.3. +option WRITE_CUSTOMIZE_ZTXT_COMPRESSION requires WRITE + # Any chunks you are not interested in, you can undef here. The # ones that allocate memory may be expecially important (hIST, # tEXt, zTXt, tRNS, pCAL). Others will just save time and make png_info # a bit smaller. @@ -500,9 +511,9 @@ chunk cHRM chunk gAMA chunk hIST chunk iCCP -chunk iTXt requires TEXT +chunk iTXt chunk oFFs chunk pCAL chunk sCAL chunk pHYs @@ -511,9 +522,9 @@ chunk sRGB chunk tEXt requires TEXT chunk tIME chunk tRNS -chunk zTXt requires TEXT +chunk zTXt # This only affects support of the optional PLTE chunk in RGB and RGBA # images. Notice that READ_ANCILLARY_CHUNKS therefore disables part # of the regular chunk reading too. @@ -540,11 +551,27 @@ option SAVE_INT_32 requires WRITE # png_save_int_32 is required by the ancillary chunks oFFs and pCAL +# added at libpng-1.5.3 +option WRITE_OPTIMIZE_CMF requires WRITE + +option READ_COMPRESSED_TEXT disabled +option READ_iCCP enables READ_COMPRESSED_TEXT +option READ_iTXt enables READ_COMPRESSED_TEXT +option READ_zTXt enables READ_COMPRESSED_TEXT +option READ_COMPRESSED_TEXT enables READ_TEXT + option WRITE_oFFs enables SAVE_INT_32 option WRITE_pCAL enables SAVE_INT_32 +option WRITE_COMPRESSED_TEXT disabled +option WRITE_iCCP enables WRITE_COMPRESSED_TEXT +option WRITE_iTXt enables WRITE_COMPRESSED_TEXT +option WRITE_zTXt enables WRITE_COMPRESSED_TEXT +option WRITE_COMPRESSED_TEXT enables WRITE_TEXT + + # Turn this off to disable png_read_png() and png_write_png() and # leave the row_pointers member out of the info structure. option INFO_IMAGE diff -ru4NwbB libpng-1.5.2/scripts/pnglibconf.h.prebuilt libpng-1.5.3beta06/scripts/pnglibconf.h.prebuilt --- libpng-1.5.2/scripts/pnglibconf.h.prebuilt 2011-02-12 09:20:50.414618000 -0600 +++ libpng-1.5.3beta06/scripts/pnglibconf.h.prebuilt 2011-05-07 21:03:07.240169000 -0500 @@ -42,8 +42,9 @@ #define PNG_16BIT_SUPPORTED #define PNG_ALIGN_MEMORY_SUPPORTED #define PNG_BENIGN_ERRORS_SUPPORTED #define PNG_bKGD_SUPPORTED +#define PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED #define PNG_CHECK_cHRM_SUPPORTED #define PNG_cHRM_SUPPORTED #define PNG_CONSOLE_IO_SUPPORTED #define PNG_CONVERT_tIME_SUPPORTED @@ -67,8 +68,9 @@ #define PNG_POINTER_INDEXING_SUPPORTED #define PNG_PROGRESSIVE_READ_SUPPORTED #define PNG_READ_16BIT_SUPPORTED #define PNG_READ_16_TO_8_SUPPORTED +#define PNG_READ_ALPHA_MODE_SUPPORTED #define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED #define PNG_READ_BACKGROUND_SUPPORTED #define PNG_READ_BGR_SUPPORTED #define PNG_READ_bKGD_SUPPORTED @@ -112,8 +114,9 @@ #define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED #define PNG_READ_USER_CHUNKS_SUPPORTED #define PNG_READ_USER_TRANSFORM_SUPPORTED #define PNG_READ_zTXt_SUPPORTED +#define PNG_READ_COMPRESSED_TEXT_SUPPORTED #define PNG_SAVE_INT_32_SUPPORTED #define PNG_sBIT_SUPPORTED #define PNG_sCAL_SUPPORTED #define PNG_SEQUENTIAL_READ_SUPPORTED @@ -150,10 +153,12 @@ #define PNG_WRITE_INTERLACING_SUPPORTED #define PNG_WRITE_INT_FUNCTIONS_SUPPORTED #define PNG_WRITE_INVERT_ALPHA_SUPPORTED #define PNG_WRITE_INVERT_SUPPORTED +#define PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION #define PNG_WRITE_iTXt_SUPPORTED #define PNG_WRITE_oFFs_SUPPORTED +#define PNG_WRITE_OPTIMIZE_CMF_SUPPORTED #define PNG_WRITE_PACK_SUPPORTED #define PNG_WRITE_PACKSWAP_SUPPORTED #define PNG_WRITE_pCAL_SUPPORTED #define PNG_WRITE_pHYs_SUPPORTED @@ -174,8 +179,9 @@ #define PNG_WRITE_USER_TRANSFORM_SUPPORTED #define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED #define PNG_WRITE_zTXt_SUPPORTED #define PNG_zTXt_SUPPORTED +#define PNG_WRITE_COMPRESSED_TEXT_SUPPORTED /*#undef PNG_ERROR_NUMBERS_SUPPORTED*/ /*#undef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED*/ /* end of options */ #endif /* PNGLCONF_H */ diff -ru4NwbB libpng-1.5.2/scripts/symbols.def libpng-1.5.3beta06/scripts/symbols.def --- libpng-1.5.2/scripts/symbols.def 2011-03-31 11:23:42.905754321 -0500 +++ libpng-1.5.3beta06/scripts/symbols.def 2011-05-07 21:41:09.118079926 -0500 @@ -226,4 +226,11 @@ png_get_current_pass_number @218 png_process_data_pause @219 png_process_data_skip @220 png_set_expand_16 @221 + png_set_text_compression_level @222 + png_set_text_compression_mem_level @223 + png_set_text_compression_strategy @224 + png_set_text_compression_window_bits @225 + png_set_text_compression_method @226 + png_set_alpha_mode @227 + png_set_alpha_mode_fixed @228